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#1
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Tube amplifier poll
I'd like to take a simple poll. I don't really want to make it into a debate
about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, Output Tube: 807 Configuration: Push Pull Parallel, cathode bias, pentode, monoblocks NFB: local only Power Output: 70W Speaker Efficiency: 91dB/m Music Type: mostly Rock and Classical |
#2
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 10, 12:15 am, "maxhifi" wrote:
I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, Output Tube: 807 Configuration: Push Pull Parallel, cathode bias, pentode, monoblocks NFB: local only Power Output: 70W Speaker Efficiency: 91dB/m Music Type: mostly Rock and Classical 6550 in PP, 75W, 86dB, mostly classical, bluegrass and international (Celtic). Peter Wieck Wyncote, PA |
#3
Posted to rec.audio.tubes
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Tube amplifier poll
"maxhifi" wrote in message news:dDRui.46876$rX4.36476@pd7urf2no... I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, Output Tube: 807 Configuration: Push Pull Parallel, cathode bias, pentode, monoblocks NFB: local only Power Output: 70W Speaker Efficiency: 91dB/m Music Type: mostly Rock and Classical KT88 PP 75 W. 6SJ7GT Input, 6SN7 LTP, fixed bias Dyna PAS w/ custom line stage, no tone controls, triode feedback pair with subsonic filter. Jazz & Rock Mark |
#4
Posted to rec.audio.tubes
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Tube amplifier poll
What is the configuration of the amplifier you most commonly listen to? Output Tube: RCA Cunningham 45 Configuration: single NFB: 0 Power Output: ~2 watts Speaker Efficiency: 95dB/m Music Type: blues, jazz, R&B Recent live music: Jeff Gautier, Patti Smith |
#5
Posted to rec.audio.tubes
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Tube amplifier poll
In article dDRui.46876$rX4.36476@pd7urf2no, "maxhifi"
wrote: I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, Output Tube: 807 Configuration: Push Pull Parallel, cathode bias, pentode, monoblocks NFB: local only Power Output: 70W Speaker Efficiency: 91dB/m Music Type: mostly Rock and Classical Mine is: Output Tube: 25L6GT Configuration: Push Pull, cathode bias, pentode NFB: none Power Output: 7 Watts per channel, continuous rating Speaker Efficiency: 96dB/m Music Type: Classic/Traditional Jazz Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
#6
Posted to rec.audio.tubes
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Tube amplifier poll
4 x 6CH6 per monobloc PP distributed load (30% screen, 10% cathode),
12W, ~0.3ohm, no global feedback, E88CC direct coupled voltage amp / concertina. Old Mission plastic-coned standmounts efficiency not known but probably highish 80s and a fairly benign load compared to more modern stuff. Small room. Some day I'll make something better. I'm more concerned with clarity and coherence than precision per se. Any good music, but symphonies upset the neighbours and they shout through the quiet bits. cheers, Ian |
#7
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Tube amplifier poll
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#8
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Tube amplifier poll
KT88 PP UL + CFB (aka Super Triode by Menno van der Veen), 30 Watt
driven by a ECC99 LTP phase splitter ECC186 anode follower, grounded cathode preamp No global feedback. Speakers are old and small Philips, no data, sound fine. Cheers! Reyer |
#9
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 10, 11:57 am, Sander deWaal wrote:
A neat list of equipment. In *active* use in our households (2, main and summer houses) a Amplification: Scott LK-150 ** Dynaco ST-70 * Dynaco ST-35 ** Harmon-Kardon Citation 16 * Integrated: Dynaco SCA-35 AR AU amp ** Revox B251 * Dynaco SCA-80Q HK Citation integrated tube amp on the bench being restored. Pre-Amp: Dynaco PAS-3 * HK Citation 17 Revox A720 ** Dynaco PAT-4 Dynaco PAT-5bifet Receiver: AR Model W and model R Receivers (one *) CD: Yamaha 5-disc changer * Philips (Holland) 5-disc changer Revox B225 ** Original 'very first' Sony discman w/transformer pack adaptor. (bench- test unit) ** Cassette: Revox B215 * HK2000 Tascam 3-head TT: Rabco ST6 * Rabco ST8 Revox B790 ** Revox B795 R/R Revox A77 "road deck" (amp & speakers included). * Speakers: AR3a ** AR4x AR M5 AR Athena sub-sat (vanishingly few were made before AR was shut down by Jensen). ** Revox Picollo sub-sat AR TSW 110 * AR 622 active sub-sat system (bench-test unit) * Tuners: AR tuner ** Dynaco FM-3 heavily modifed * Dynaco FM-3 full-factory Dynaco FM-5 Dynaco AF-6 (repeat) Revox A720 ** HK-500 HK Citation 15 Grundig Satellit 700 (OK, a full-band portable radio with a very nice stereo FM 'front end'). ** * = Likely to be still in service 6 months from now. ** = will be pried from my cold, dead fingers. Note that some of these ** choices are somewhat irrational and sentimental and/or for the purposes of "completeness" rather than for any particularly great sound as may come out of or through them. No reference is made (except once) as to any modifications or changes that may or may not have been made. The rest of the stuff comes and goes as do the tides based on whim, better offers or trades. And the list of "what once was" is far too long for this venue. Peter Wieck Wyncote, PA |
#10
Posted to rec.audio.tubes
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Tube amplifier poll
Peter Wieck said:
snip nice list The rest of the stuff comes and goes as do the tides based on whim, better offers or trades. And the list of "what once was" is far too long for this venue. That goes for most of us, I think. ;-) How's your homebrew-tube amp project going, Peter? -- - Maggies are an addiction for life. - |
#11
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 10, 3:48 pm, Sander deWaal wrote:
How's your homebrew-tube amp project going, Peter? Slowly. I am loath to bend sheet-metal until I have a firm circuit. Each circuit I try has its advantages and disadvantages... right now, I am investigating a PP 6L6/5881 configuration, each channel using a single 12AX7 as driver w/a very simple SS power-supply. It sure takes a load off the power-transformer, appears to be very stable while breadboarded on the bench, makes nice sound and is quite simple. Everything gets to be a little bit lazy, a good thing for stability and longevity. My test speakers for this are the AR Athenas, the satellites are tiny (1.5"dome mid & 3/4" dome tweet) and the sub ( 2 x 8" long-throw) makes a nice footrest under the bench. And those speakers would likely be the permanent mates. I also tried a near-duplicate of the Dynaco ST-35 circuit with a fixed- bias circuit and based on 6BQ5 outputs, and I am tempted to try the original 7591A output tubes as Fisher configured for the original iron... So many things to try, so little time. I think I rejected the 6BQ5 option as I want a bit more than 13 watts, but I would settle for a reliable 20, well within the range of the 5881 in PP Class A. And I prefer to be able to use readily available (to me) NOS; or vintage tubes already in hand. I am contemplating a very simple black-box type cosmetic layout with the transformers concealed and the tubes caged behind the front panel. Just an LED or neon pilot on the front panel, the on/off switch being a momentary-contact relay-system so that any interruption of power would cause complete shut-down... no possibility of automatic re- start. Cats and grandkids preclude exposed tubes, but suchlike was never a big thing of mine, eyewash does not sound much, good or bad. But all that is the easy part. It's the circuit that is taking the time and making me waffle... Peter Wieck Wyncote, PA |
#12
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 9, 9:15 pm, "maxhifi" wrote:
I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, I switch one of three amps when I arrive in my study, and a fourth one when my family goes to bed: Output Tube: trioded EL34; 300B; Quad silicon; 6SN7 for electrostatic headphones Configuration: Push Pull; SE; PP; balanced PP NFB: adjustable, usually none; none; I don't ask about the NFB in the Quad SS amps!; none Power Output: 20W; 3.7W; 140W; maybe one watt Speaker Efficiency: Quad ESL-63 86dB/m, Lowther type horns 103dB/m Music Type: Classical (and classic rock'n'roll) -- I play mostly chamber music and voices Andre Jute Visit Jute on Amps at http://members.lycos.co.uk/fiultra/ "wonderfully well written and reasoned information for the tube audio constructor" John Broskie TubeCAD & GlassWare "an unbelievably comprehensive web site containing vital gems of wisdom" Stuart Perry Hi-Fi News & Record Review |
#13
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 10, 8:08 am, John Byrns wrote:
Mine is: Output Tube: 25L6GT Configuration: Push Pull, cathode bias, pentode NFB: none Power Output: 7 Watts per channel, continuous rating Speaker Efficiency: 96dB/m Music Type: Classic/Traditional Jazz Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ Is this your notorious "Amplifier without Transformer"? BobC LOL |
#14
Posted to rec.audio.tubes
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Tube amplifier poll
In article .com,
Andre Jute wrote: On Aug 10, 8:08 am, John Byrns wrote: Mine is: Output Tube: 25L6GT Configuration: Push Pull, cathode bias, pentode NFB: none Power Output: 7 Watts per channel, continuous rating Speaker Efficiency: 96dB/m Music Type: Classic/Traditional Jazz Is this your notorious "Amplifier without Transformer"? Hi Andre, No, it is my notorious "Power Amplfier without Power Transformer", it is hardly without transformers as it has four. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
#15
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 10, 6:16 pm, Bret Ludwig wrote:
Slowly. I am loath to bend sheet-metal until I have a firm circuit. Why? A genenric box accommodates many circuits. Each circuit I try has its advantages and disadvantages... right now, I am investigating a PP 6L6/5881 configuration, each channel using a single 12AX7 as driver w/a very simple SS power-supply. It sure takes a load off the power-transformer, appears to be very stable while breadboarded on the bench, makes nice sound and is quite simple. Everything gets to be a little bit lazy, a good thing for stability and longevity. My test speakers for this are the AR Athenas, the satellites are tiny (1.5"dome mid & 3/4" dome tweet) and the sub ( 2 x 8" long-throw) makes a nice footrest under the bench. And those speakers would likely be the permanent mates. I also tried a near-duplicate of the Dynaco ST-35 circuit with a fixed- bias circuit and based on 6BQ5 outputs, and I am tempted to try the original 7591A output tubes as Fisher configured for the original iron... So many things to try, so little time. I think I rejected the 6BQ5 option as I want a bit more than 13 watts, but I would settle for a reliable 20, well within the range of the 5881 in PP Class A. And I prefer to be able to use readily available (to me) NOS; or vintage tubes already in hand. Build around whatever's handy, change later. I am contemplating a very simple black-box type cosmetic layout with the transformers concealed and the tubes caged behind the front panel. Just an LED or neon pilot on the front panel, the on/off switch being a momentary-contact relay-system so that any interruption of power would cause complete shut-down... no possibility of automatic re- start. Cats and grandkids preclude exposed tubes, but suchlike was never a big thing of mine, eyewash does not sound much, good or bad. Easy to fab a cover. But all that is the easy part. It's the circuit that is taking the time and making me waffle... Bull****. You're stalling. Build something, any goddamned thing. Anything actually built-even single ended triodes, as hard as it is to believe-sounds better thatn the best idea not built. If you want an amp to listen to build any of several known good circuits. If you want to tinker, build a GOOD power supply for bench or static use and then breadboard the circuits. Known good basic designs include the Williamson, Marantz, several RCA and MO/GEC tube manual designs, and many others. Build, listen, test, rework, whatever suits your fancy. But don't spend a lot of time on thinking without building.- Hide quoted text - - Show quoted text - Bret, with all due respect (none), eat **** and die. Peter Wieck Wyncote, PA |
#16
Posted to rec.audio.tubes
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Thanks everyone for your responses!
There's quite a variety represented here - most foreign to me are the push
pull 845s, and the fact that speakers actually exist to make an SE 45 useful! "maxhifi" wrote in message news:dDRui.46876$rX4.36476@pd7urf2no... I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, Output Tube: 807 Configuration: Push Pull Parallel, cathode bias, pentode, monoblocks NFB: local only Power Output: 70W Speaker Efficiency: 91dB/m Music Type: mostly Rock and Classical |
#17
Posted to rec.audio.tubes
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Tube amplifier poll
I am investigating a PP 6L6/5881 configuration, each channel using a
single 12AX7 as driver w/a very simple SS power-supply. It sure takes a load off the power-transformer, appears to be very stable while breadboarded on the bench, makes nice sound and is quite simple. I have an old ST70-II carcass (it looks like the circuit board caught fire) which I've often thought of rebuilding into something similar. My thoughts are as follows 6L6 in p-p, pentode, local feedback around the output stage, regulated screen voltage, cathode bias, and a 6SL7 driver. |
#18
Posted to rec.audio.tubes
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Thanks everyone for your responses!
On Aug 10, 7:08 pm, "maxhifi" wrote:
There's quite a variety represented here - most foreign to me are the push pull 845s, and the fact that speakers actually exist to make an SE 45 useful! That "useful" is an exceedingly small universe, pretty much limited to extremely efficient speakers and signal with a PA average of about 10dB or so and for those who wish to listen either to very limited repertoire and/or at very low volume. Not to say that such do not exist, but that they are not particularly adapted to the way that most of us use our systems in the real world. It is only a certain sort of person that can convince themselves that 90hz to 15,000hz down 6dB or more at anything outside those limits can be mistaken for "full frequency". Peter Wieck Wyncote, PA |
#19
Posted to rec.audio.tubes
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Tube amplifier poll
In article om,
Peter Wieck wrote: On Aug 10, 3:48 pm, Sander deWaal wrote: How's your homebrew-tube amp project going, Peter? Slowly. I am loath to bend sheet-metal until I have a firm circuit. Each circuit I try has its advantages and disadvantages... right now, I am investigating a PP 6L6/5881 configuration, each channel using a single 12AX7 as driver w/a very simple SS power-supply. It sure takes a load off the power-transformer, appears to be very stable while breadboarded on the bench, makes nice sound and is quite simple. Everything gets to be a little bit lazy, a good thing for stability and longevity. My test speakers for this are the AR Athenas, the satellites are tiny (1.5"dome mid & 3/4" dome tweet) and the sub ( 2 x 8" long-throw) makes a nice footrest under the bench. And those speakers would likely be the permanent mates. I also tried a near-duplicate of the Dynaco ST-35 circuit with a fixed- bias circuit and based on 6BQ5 outputs, and I am tempted to try the original 7591A output tubes as Fisher configured for the original iron... So many things to try, so little time. I think I rejected the 6BQ5 option as I want a bit more than 13 watts, but I would settle for a reliable 20, well within the range of the 5881 in PP Class A. And I prefer to be able to use readily available (to me) NOS; or vintage tubes already in hand. I am contemplating a very simple black-box type cosmetic layout with the transformers concealed and the tubes caged behind the front panel. Just an LED or neon pilot on the front panel, the on/off switch being a momentary-contact relay-system so that any interruption of power would cause complete shut-down... no possibility of automatic re- start. Cats and grandkids preclude exposed tubes, but suchlike was never a big thing of mine, eyewash does not sound much, good or bad. But all that is the easy part. It's the circuit that is taking the time and making me waffle... I don't understand why you are waffling, reading between the lines you wrote above it is clear you already have your circuit. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
#21
Posted to rec.audio.tubes
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Thanks everyone for your responses!
"Id ita" wrote in message ... So, the current fave 45 is suited to meet current real-world facts: my modest SPL requirement, a preference for small-ensemble music, an acceptable driver on hand, and a willingness to take the narrow path through a deeper experience than that which can be measured and quantified by pedestrian means. What kind of driver is it? I built a stereo 2A3 amplifier, using EF37A drivers, and a 6CA4 rectifier, and love the sound of it, however, it's too weak to use full time with my main speakers. |
#22
Posted to rec.audio.tubes
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Thanks everyone for your responses!
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#23
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 10, 8:08 pm, John Byrns wrote:
In article om, Peter Wieck wrote: On Aug 10, 3:48 pm, Sander deWaal wrote: How's your homebrew-tube amp project going, Peter? Slowly. I am loath to bend sheet-metal until I have a firm circuit. Each circuit I try has its advantages and disadvantages... right now, I am investigating a PP 6L6/5881 configuration, each channel using a single 12AX7 as driver w/a very simple SS power-supply. It sure takes a load off the power-transformer, appears to be very stable while breadboarded on the bench, makes nice sound and is quite simple. Everything gets to be a little bit lazy, a good thing for stability and longevity. My test speakers for this are the AR Athenas, the satellites are tiny (1.5"dome mid & 3/4" dome tweet) and the sub ( 2 x 8" long-throw) makes a nice footrest under the bench. And those speakers would likely be the permanent mates. I also tried a near-duplicate of the Dynaco ST-35 circuit with a fixed- bias circuit and based on 6BQ5 outputs, and I am tempted to try the original 7591A output tubes as Fisher configured for the original iron... So many things to try, so little time. I think I rejected the 6BQ5 option as I want a bit more than 13 watts, but I would settle for a reliable 20, well within the range of the 5881 in PP Class A. And I prefer to be able to use readily available (to me) NOS; or vintage tubes already in hand. I am contemplating a very simple black-box type cosmetic layout with the transformers concealed and the tubes caged behind the front panel. Just an LED or neon pilot on the front panel, the on/off switch being a momentary-contact relay-system so that any interruption of power would cause complete shut-down... no possibility of automatic re- start. Cats and grandkids preclude exposed tubes, but suchlike was never a big thing of mine, eyewash does not sound much, good or bad. But all that is the easy part. It's the circuit that is taking the time and making me waffle... I don't understand why you are waffling, reading between the lines you wrote above it is clear you already have your circuit. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/- Hide quoted text - - Show quoted text - John: I have tried (breadboarded) two circuits. Both had their merits, but the 6BQ5 circuit was just too 'little'. I am tempted to try one or two more including one based on the 7591A, and one possibly with different drivers before I bend and punch sheet metal. That's really all there is to it. I am not in a hurry, and I am trying to learn rather than assemble by rote. Peter Wieck Wyncote, PA |
#24
Posted to rec.audio.tubes
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Thanks everyone for your responses!
On Aug 10, 10:07 pm, (Id ita) wrote:
An SE enthusiast faced with a limited choice of drivers is no less prone than anybody else to mistake such a limited range for "full frequency". And the real situation is not so dire. (We) are prone, however, to gerrymander our priorities to fit the limitations of the gear, in order to receive a singular blessing. I've built clean PP amps that were subjectively blameless, but always lacked the ineffable qualities of "involvement" and "presentation" that even a casual SE design would bring right back. The strengths in each approach are not mutually exclusive, and can be combined in the right implementation, but I'm still getting there. So, the current fave 45 is suited to meet current real-world facts: my modest SPL requirement, a preference for small-ensemble music, an acceptable driver on hand, and a willingness to take the narrow path through a deeper experience than that which can be measured and quantified by pedestrian means. If you say so... It really reads in a perverse sort of way along the lines of the statement: "It feels so good when I stop banging my head". Again, I have heard flea-powered SE systems with various sorts of drivers that sound etherially beautiful... with very limited signal such as solo voice, or Gregorian Chant as two examples. But not with much else. Peter Wieck Wyncote, PA |
#25
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 10, 3:30 pm, John Byrns wrote:
In article .com, Andre Jute wrote: On Aug 10, 8:08 am, John Byrns wrote: Mine is: Output Tube: 25L6GT Configuration: Push Pull, cathode bias, pentode NFB: none Power Output: 7 Watts per channel, continuous rating Speaker Efficiency: 96dB/m Music Type: Classic/Traditional Jazz Is this your notorious "Amplifier without Transformer"? Hi Andre, No, it is my notorious "Power Amplfier without Power Transformer", it is hardly without transformers as it has four. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ Not much of a revolutionary you are! Mind you, I've just done an OTL amp for my electrostatic headphones (only two power transformers if you don't count the two chokes), so between the two of us we're halfway there! Up the winders! Andre Jute A little inaccuracy sometimes saves tons of explanation. --H.H.Munro ("Saki")(1870-1916) Visit Jute on Amps at http://members.lycos.co.uk/fiultra/ "wonderfully well written and reasoned information for the tube audio constructor" John Broskie TubeCAD & GlassWare "an unbelievably comprehensive web site containing vital gems of wisdom" Stuart Perry Hi-Fi News & Record Review |
#26
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Thanks everyone for your responses!
On Aug 10, 5:08 pm, "maxhifi" wrote:
There's quite a variety represented here - most foreign to me are the push pull 845s, and the fact that speakers actually exist to make an SE 45 useful! Check out The Impresario speaker and the High Wife Acceptance Factor Lowther bicor horn at http://members.lycos.co.uk/fiultra/JUTE%20ON%20AMPS.htm They also have associated low-power amps, respectively the 'SEntry' and 'Minus Zero'. Andre Jute "maxhifi" wrote in message news:dDRui.46876$rX4.36476@pd7urf2no... I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, Output Tube: 807 Configuration: Push Pull Parallel, cathode bias, pentode, monoblocks NFB: local only Power Output: 70W Speaker Efficiency: 91dB/m Music Type: mostly Rock and Classical |
#27
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Tube amplifier poll
On Aug 10, 6:08 pm, John Byrns wrote:
In article om, Peter Wieck wrote: .......... It's the circuit that is taking the time and making me waffle... I don't understand why you are waffling, reading between the lines you wrote above it is clear you already have your circuit. Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ I imagine every janitor, even one as worthless as Wiecky, knows not to stick his hands in electricity but to telephone for someone competent to do the job. Andre Jute |
#28
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Tube amplifier poll
Output Tube: 6V6GT Configuration: Push Pull,cathode bias.. NFB: Yes;adjustable Power Output: 8W per channel before any signs of distortion on the 'scope. Speaker Efficiency: unknown.(sorta lowish,but in a small room) Music Type: Any,and everything..(Except Country! Blech!) Schematic and pic. (Dynaco ST-70 beside it) It's from a Sears "Silvertone" console of some sort. http://www.users.qwest.net/~ptaylor/...e_amp_Mods.gif http://www.users.qwest.net/~ptaylor/...PP-6V6_amp.jpg (And again,Thanks to Brian McAllister for the Sams info!) :-) |
#29
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Tube amplifier poll
On Aug 11, 10:29 am, Andre Jute wrote:
I imagine every janitor, even one as worthless as Wiecky, knows not to stick his hands in electricity but to telephone for someone competent to do the job. Andre Jute So, the stroke victim resurfaces? Can Mr. McCoy and its sockpuppets be far behind? Clearly a nice long supervised rest did not have the desired results? I would suspect, Andre, that I have been around and further with electricity and its applications (in audio and elsewhere) than you have been even in your wildest pretenses. If your wiring skills... even in breadboarding... are as you have already illustrated with your non-functioning "ultra-fi" amp as displayed in this venue are indicative of your overall skills, you would be the last creature on earth to be the critic. But, don't lose any sleep over it, Andre. My preliminary designs actually work. Not that they are anything much more than derivative of and refinements of designs that have been out there for 40 years or more, but at least I have the grace to admit that rather than pretending that what I am doing is either revolutionary or unique. But that they work must be acutely frustrating to you. Sorry about that. I promise to blow up a $0.05 Chinese electrolytic capacitor in your name the next time I am at the bench. Will that make you feel better? But I will not offer a design that burns controls... that is your particular domain and level of expertise. I run all the test-beds through an isolation transformer with the output side on a 3A dual-element fuse. No loses so far. How about you? Is that "Ultra-Fi" playing yet? Even passing signal (however briefly)? Peter Wieck Wyncote, PA |
#30
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Tube amplifier poll
On Aug 11, 10:35 am, Bret Ludwig wrote:
John: I have tried (breadboarded) two circuits. Both had their merits, but the 6BQ5 circuit was just too 'little'. I am tempted to try one or two more including one based on the 7591A, and one possibly with different drivers before I bend and punch sheet metal. So tell us, what drives you to fool with such an undesireable tube such as the 7591, expensive, not terribly available? That I have a bunch in hand... no more. Peter Wieck Wyncote, PA |
#31
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Thanks everyone for your responses!
First Worthless Wiecky twitched his net curtain to give us his worn-
out prissy-mouthed omnidirectional disapproval of everything outside the narrowest norm of the lowest common denominator, a true janitor's out-of-the-toilet, puckered bottom-up view of audio: : On Aug 10, 7:08 pm, "maxhifi" wrote: There's quite a variety represented here - most foreign to me are the push pull 845s, and the fact that speakers actually exist to make an SE 45 useful! That "useful" is an exceedingly small universe, pretty much limited to extremely efficient speakers and signal with a PA average of about 10dB or so and for those who wish to listen either to very limited repertoire and/or at very low volume. This is untrue. Not to say that such do not exist, but that they are not particularly adapted to the way that most of us use our systems in the real world. So why say what you next admit is a lie, Worthless? It is only a certain sort of person that can convince themselves that 90hz to 15,000hz down 6dB or more at anything outside those limits can be mistaken for "full frequency". This too is nonsense. What is true is that it is only a certain class of fascist who believes he can prescribe what other people should use and enjoy. As I've said before, Worthless, you are genetically, and by your condition and ineradicable envy of your betters, a fascist. Peter Wieck Wyncote, PA Sounds more like Salem in the days of Cotton Mather to me every time I am unfortunate enough to see someone replying to your pompous witterings. Then Barry Bialos wrote: An SE enthusiast faced with a limited choice of drivers is no less prone than anybody else to mistake such a limited range for "full frequency". And the real situation is not so dire. Right. He doesn't need to make any such adaptation except by choice. It is only fashion victims, parroting the latest street gossip, like Worthless Wiecky, who haven't yet discovered that it is no problem making an SE amp with audio range output, and powerful enough to drive any speaker with any range you desire or prefer. I built 80W SE amps, and we have an example right now of Patrick building 50-60W SE amps, but the idiot Wiecky mutters on about low power being a necesary condition of SE. The little janitor isn't only stupid, he's blind and deaf as well. What's more, if low power tubes sound sweetest, and some very sweet tubes have very low power, all it takes to build or buy a horn that will give full audio spectrum on vanishingly small power is money and the balls to face down idiots who will say your horn is too big for their houses -- then they needn't have it! It is absolutely no technical problem building a full-range horn all the way down to 16Hz, and a very modestly sized horn, as horns go, can easily with the aid of woofer give 20Hz-22kHz. But people secure in their own taste have a right to reserve to themselves alone the choice of balanced natural sound, as distinct from the engineering wet dream of an arbitrarily chosen "audio range". (Not even to mention that the idiots who decry everyone else's choices on investigation are in 99 per cent of cases discovered not to own speakers that can manage their wet dream, or speakers even anywhere near as good are already owned by those they decry. Or, to mention only the specifics of Worthless Wiecky's stupidities, he is of an age when he has long since ceased to hear that 15kHz he now jeers is too low for everyone else. Now watch the outburst of rage when someone applies a modicum of logic to his spiteful vomitings: the little man likes handing it out but he can't take it.) (We) are prone, however, to gerrymander our priorities to fit the limitations of the gear, in order to receive a singular blessing. And we have a perfect right to do so. However, as it happens, I love chamber music and vocal music, including Gregorian Chant, and I choose the gear accordingly. For some fascist mentality to come tell us that we made a mistake in choosing our gear and are depriving us of whatever his favourite music might be (you can spot the tenth-raters on RAT easily -- they never speak of the rapture of music) is simply intolerable. Hey, I have the money and the space and intellectual ability, so I once built special speakers for Gregorian chant, but I feel no need to apologize for them by saying that of course I also have other speakers for more general purposes. I've built clean PP amps that were subjectively blameless, but always lacked the ineffable qualities of "involvement" and "presentation" that even a casual SE design would bring right back. It's tough to design a really good PP amp because the mentality we inherit -- as Worthless Wiecky has just demonstrated again -- is the engineering paradigm of maximum power for minimum cost. Once you lose that depressing burden, which only requires putting your mind in gear, it becomes much easier to make a good PP amp. It should be built of triodes or trioded pentodes (which sound quite as good as DHT if you limit the operating range to the most linear part of the transfer), and it should be strictly Class A and have zero or very little NFB (which three things together make the sound that is mistaken called "single-ended sound"). The strengths in each approach are not mutually exclusive, and can be combined in the right implementation, but I'm still getting there. Hallelujah. Stick around Barry; we can do with another positive outlook; sometimes it seems as if the congenitally negative creeps like Worthless Wiecky are all that is on RAT, which is a view that does an injustice to the many open-minded strivers after truth and glee who contribute to or lurk on RAT. So, the current fave 45 is suited to meet current real-world facts: my modest SPL requirement, a preference for small-ensemble music, an acceptable driver on hand, and a willingness to take the narrow path through a deeper experience than that which can be measured and quantified by pedestrian means. Nothing pedestrian about a banksa6550 PP amp with so much NFB that ever-diminishing, of course, harmonics numbers must be given in superscripts of magnitudes: "and the 513^10^3 harmonic is umpteen thousand decibels below audibility..." A lot of topclass engineering hours went into it and many are willing to pay for the bragging rights. We should respect that too. Horses for courses, as some living saint once said. Let a thousand flowers bloom, and one will smell sweet. The trick is knowing which one that is. A Class A ZNFB triode amp of very conservative design coupled to high-sensitivity point source speakers multiplies the audiophile's predictive abilities by at least two or three magnitudes. Regards, Barry Bialos Andre Jute Visit Jute on Amps at http://members.lycos.co.uk/fiultra/ "wonderfully well written and reasoned information for the tube audio constructor" John Broskie TubeCAD & GlassWare "an unbelievably comprehensive web site containing vital gems of wisdom" Stuart Perry Hi-Fi News & Record Review |
#32
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Tube amplifier poll
"PhattyMo" wrote in message ... Output Tube: 6V6GT Configuration: Push Pull,cathode bias.. NFB: Yes;adjustable Power Output: 8W per channel before any signs of distortion on the 'scope. Speaker Efficiency: unknown.(sorta lowish,but in a small room) Music Type: Any,and everything..(Except Country! Blech!) Those look like my fav. sylvania 6V6's - and nice paint job! |
#33
Posted to rec.audio.tubes
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Tube amplifier poll
iv got a citation 5 harman/kardon 40watt p/ch rms.
a citation 1 harman/kardon preamp. home made mixer/preamp with 5.1 output tube sound simulator built in and tube headphone amp built in, has 16 inputs and 5 line outputs, 2 cannon 3pin inputs, 2 cannon outputs for pro audio, guitar input for marshall amp, 2 power suppies 1 for headphone amp the other is a 200watt pc/power supply modified for rest of it. and a marshall 9200 2/ch 100watt rms p/ch 1 rack case server with mp3 music, a radio card,automation software for controll of power and controll of audio and reel/reel controll- etc. marshall amp has 8 5881 tubes and 4 12ax7 tubes. harman/kardon has 4 7581 tubes 2 12by7 and 2 6cg7. harman/kardon preamp has 4 12ax7 5 12at7. i have some home made tube amps and a 200watt NTS power amp it has 4 kt66 gec and 4 6sj7 2 6au4 tubes. other amps i have need work. "maxhifi" wrote in message news:dDRui.46876$rX4.36476@pd7urf2no... I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, Output Tube: 807 Configuration: Push Pull Parallel, cathode bias, pentode, monoblocks NFB: local only Power Output: 70W Speaker Efficiency: 91dB/m Music Type: mostly Rock and Classical |
#34
Posted to rec.audio.tubes
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Tube amplifier poll
Nothing as fancy or exotic as what most of you all have:
1959 Zenith console Model SF2580 dubbed the "Schubert" by Zenith. Output Tube: EL84 (4) Configuration: Push Pull, I believe NFB: (not a clue what that means) Power Output: 40W according to the instruction manual. I presume they mean 20W per channel. Speaker Efficiency: I dunno - the ones that came with the console... Music Type: mostly Soundtracks, Showtunes, Country. A little bit of everything exept Rap, Hip hop, etc. Another I listen to just as much: 1964 Sears Silvertone receiver, Model 7408 All original works - not one cap or tube replaced so far. Output Tube: EL84 (4) Configuration: Push Pull, I believe NFB: (not a clue what that means) Power Output: I dunno Speaker Efficiency: I dunno. Currently using modern KLH speakers. Music Type: mostly Soundtracks, Showtunes, Country. A little bit of everything exept Rap, Hip hop, etc. Gerry |
#35
Posted to rec.audio.tubes
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Tube amplifier poll
My system:
Sony DVD changer, well broken in. P-P EL34, dioded-triode, 6DJ8, 6SN7. Mission bookshelves and Edgarhorn 80Hz woofers. Music: Often Happy Ears! Al |
#36
Posted to rec.audio.tubes
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Tube amplifier poll
In article om,
tubegarden wrote: My system: Sony DVD changer, well broken in. P-P EL34, dioded-triode, 6DJ8, 6SN7. "dioded-triode", sounds interesting, can you tell us more about this? Regards, John Byrns -- Surf my web pages at, http://fmamradios.com/ |
#37
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Tube amplifier poll
On Aug 10, 12:15 am, "maxhifi" wrote:
I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? I'll start with mine, Output Tube: 807 Configuration: Push Pull Parallel, cathode bias, pentode, monoblocks NFB: local only Power Output: 70W Speaker Efficiency: 91dB/m Music Type: mostly Rock and Classical Several... all pentodes in P-P, cathode bias, mono, quite large NFB used, various quality OPT's - the least, but still OK, being a Hammond 125E. Three with 2 x 6V6, max 10 to 12 watts each (one max 8 watts, lower B +) Two with 2 x 6L6, max 18 to 20 watts each A couple with 2 x 6BM8's in P-P (receivers), circa max 6 wpc each. Planned: stereo, 4 x 6BQ5 (for 10 o 14 wpc) or 6L6 or EL34 (for 18-20 wpc)... to be advised, still thinking about it ands no time to start the project yet. Cheers, Roger |
#38
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 12, 7:13?am, John Byrns wrote:
"dioded-triode", sounds interesting, can you tell us more about this? Regards, John Byrns It is using a SS diode between the plate and the screen, or the screen R. When I posted somewhere I had done the triode mod, some good soul emailed me privately and suggested using diodes. I eventually got four of the same diodes and tried it. It is one of those simple mods that have improved my listening. Happy Ears! Al |
#39
Posted to rec.audio.tubes
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Tube amplifier poll
On Aug 10, 5:15?am, "maxhifi" wrote:
I'd like to take a simple poll. I don't really want to make it into a debate about the merits of various configurations, I'm just curious about what's in use. What is the configuration of the amplifier you most commonly listen to? Balanced Push Pull all DHT amplifier on 2 chassis, driven from a balanced DAC Mains transformer 0-300v Actual voltage 312v Resistance of secondary 39R First cap: 47uF electrolytic Voltage:366 Choke: 10uF 91R Second cap: 80uF polyprop Voltage:354 Choke 10uF 150R Third cap: 40uF polyprop Voltage:350 Resistor: 1.6k measured, probably 1.5k Fourth cap: 40uF polyprop Voltage:341 Input stage = differential pair, DC coupled to driver stage Valve type: 30 globe Mu=9.3 Anode resistance 10.3 Anode resistor = 60k Anode Voltage = 156 Cathode resistor = CCS Bypass = none Cathode Voltage = 9.7 Current each valve = 3mA Driver stage = differential pair, push pull Valve type: 112A globe Mu=8.5 Anode resistance 5.1k Anode resistor = Transformer 1:1 Anode Voltage = 350 Cathode resistor = 11.5k shared Bypass = none Cathode Voltage = 172 Current each valve = 7.5mA Output stage = differential pair, push pull Valve type: 2a3 Mu=4.2 Anode resistance 800R Anode resistor = Transf. 6.6k Anode Voltage = 354 Cathode resistor = 622 shared Bypass = 100uF Polyprop Cathode Voltage = 58 Current each valve = 46mA |
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