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8045g tubes
On Mon, 6 Sep 2004 16:43:03 -0400, "Ken Platt"
wrote: Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? First do an exhaustive Google search on the topic, concentrating on rec.audio.tubes . Second, my always shaky memory is that the 8045 was a rebasing of an ordinary sweep tube, with the G2 (screen) driven, a classic Tim Paravicini device. If you could email me the schematic I could comment further. Conversion from high perveance sweep tubes to medium perveance conventional audio tubes may not be ideal. OTOH, conversion to tubes currently made in St. Petersburg has its own positive side. Remaining sweep tubes are .... remaining. Chris Hornbeck |
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#2
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On Mon, 6 Sep 2004 16:43:03 -0400, "Ken Platt"
wrote: Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? First do an exhaustive Google search on the topic, concentrating on rec.audio.tubes . Second, my always shaky memory is that the 8045 was a rebasing of an ordinary sweep tube, with the G2 (screen) driven, a classic Tim Paravicini device. If you could email me the schematic I could comment further. Conversion from high perveance sweep tubes to medium perveance conventional audio tubes may not be ideal. OTOH, conversion to tubes currently made in St. Petersburg has its own positive side. Remaining sweep tubes are .... remaining. Chris Hornbeck |
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#4
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In article ,
says... On Mon, 6 Sep 2004 16:43:03 -0400, "Ken Platt" wrote: Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? First do an exhaustive Google search on the topic, concentrating on rec.audio.tubes . Second, my always shaky memory is that the 8045 was a rebasing of an ordinary sweep tube, with the G2 (screen) driven, a classic Tim Paravicini device. If you could email me the schematic I could comment further. Conversion from high perveance sweep tubes to medium perveance conventional audio tubes may not be ideal. OTOH, conversion to tubes currently made in St. Petersburg has its own positive side. Remaining sweep tubes are .... remaining. Chris Hornbeck Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Google For 6cg7 http://www.vacuumtubes.com/6cg7.html http://www.tubedepot.com/6cg76fq7.html http://www.lpgear.com/Merchant2/merchant.mvc? Screen=PROD&Store_Code=LG&Product_Code=EY66 http://www.tubeaudiostore.com/6cg7lownoise.html |
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#5
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"I Care" wrote in message
t... Chris Hornbeck Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Huh? Excuse me, but that doesn't compute. The 8045G was a power output tube, as has been described in other replies. The 6CG7/6FQ7 was a small-signal dual triode, electrically more or less equivalent to the 6SN7. Nowhere near the same sector of the galaxy. Looking at the link from 8045G, I find a data sheeet that looks about right, although since it's in Japanese I can't really tell. Looking at the listing for 6240G, their statement makes no sense whatsoever. Peace, Paul |
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#6
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"I Care" wrote in message
t... Chris Hornbeck Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Huh? Excuse me, but that doesn't compute. The 8045G was a power output tube, as has been described in other replies. The 6CG7/6FQ7 was a small-signal dual triode, electrically more or less equivalent to the 6SN7. Nowhere near the same sector of the galaxy. Looking at the link from 8045G, I find a data sheeet that looks about right, although since it's in Japanese I can't really tell. Looking at the listing for 6240G, their statement makes no sense whatsoever. Peace, Paul |
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#7
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"I Care" = no you dont !! Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 ** Which is a ridiculous MISPRINT !! ........... Phil |
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#8
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"I Care" = no you dont !! Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 ** Which is a ridiculous MISPRINT !! ........... Phil |
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#9
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On Tue, 07 Sep 2004 03:41:44 GMT, I Care wrote:
Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Ned is unlikely to have left such a blunder on his page. I'll check it out, but in the meantime, keep looking, cause this is bogus. BTW, search in newsgroups, or whatever they call it in Google. Chris Hornbeck |
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#10
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On Tue, 07 Sep 2004 03:41:44 GMT, I Care wrote:
Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Ned is unlikely to have left such a blunder on his page. I'll check it out, but in the meantime, keep looking, cause this is bogus. BTW, search in newsgroups, or whatever they call it in Google. Chris Hornbeck |
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#11
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On Tue, 07 Sep 2004 04:13:43 GMT, Chris Hornbeck
wrote: http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Ned is unlikely to have left such a blunder on his page. I'll check it out, but in the meantime, keep looking, cause this is bogus. OK, the page has three different tubes shown, including the 8045, which does *not* look like a G2 driven beam tube. Ignore my previous comments about rebasing sweep tubes and keep looking. May still have been the rebasing of conventional audio tubes. For a push-pull plate load of 3600 ohms and idling dissipation of 40 watts, you'll probably want to go with the big bottles of the KT88/6550 family. Pin-out even looks like a plug in fit. But you'll need to check for any extra connections on the socket base pins. For the EL34 family you'll want to connect pin 1 to pin 8. Good fortune, Chris Hornbeck |
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#12
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On Tue, 07 Sep 2004 04:13:43 GMT, Chris Hornbeck
wrote: http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Ned is unlikely to have left such a blunder on his page. I'll check it out, but in the meantime, keep looking, cause this is bogus. OK, the page has three different tubes shown, including the 8045, which does *not* look like a G2 driven beam tube. Ignore my previous comments about rebasing sweep tubes and keep looking. May still have been the rebasing of conventional audio tubes. For a push-pull plate load of 3600 ohms and idling dissipation of 40 watts, you'll probably want to go with the big bottles of the KT88/6550 family. Pin-out even looks like a plug in fit. But you'll need to check for any extra connections on the socket base pins. For the EL34 family you'll want to connect pin 1 to pin 8. Good fortune, Chris Hornbeck |
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#13
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In article ,
says... "I Care" = no you dont !! Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 ** Which is a ridiculous MISPRINT !! .......... Phil You are right!! I don't care for your uncalled for inflammatory comments, but I do care enough to try to help, even if it ends up the information provided to me was incorrect. Prove you care and help him find the tube he needs. |
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#14
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In article ,
says... "I Care" = no you dont !! Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 ** Which is a ridiculous MISPRINT !! .......... Phil You are right!! I don't care for your uncalled for inflammatory comments, but I do care enough to try to help, even if it ends up the information provided to me was incorrect. Prove you care and help him find the tube he needs. |
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#15
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Thanks for everyone's help so far.
I had seen that same interchangable statement and had assumed it was false as well. Any suggestion of what news group to pose the question regarding the conversion? thx ken "Chris Hornbeck" wrote in message news  On Tue, 07 Sep 2004 04:13:43 GMT, Chris Hornbeck wrote: http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Ned is unlikely to have left such a blunder on his page. I'll check it out, but in the meantime, keep looking, cause this is bogus. OK, the page has three different tubes shown, including the 8045, which does *not* look like a G2 driven beam tube. Ignore my previous comments about rebasing sweep tubes and keep looking. May still have been the rebasing of conventional audio tubes. For a push-pull plate load of 3600 ohms and idling dissipation of 40 watts, you'll probably want to go with the big bottles of the KT88/6550 family. Pin-out even looks like a plug in fit. But you'll need to check for any extra connections on the socket base pins. For the EL34 family you'll want to connect pin 1 to pin 8. Good fortune, Chris Hornbeck |
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#16
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Thanks for everyone's help so far.
I had seen that same interchangable statement and had assumed it was false as well. Any suggestion of what news group to pose the question regarding the conversion? thx ken "Chris Hornbeck" wrote in message news On Tue, 07 Sep 2004 04:13:43 GMT, Chris Hornbeck wrote: http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 Ned is unlikely to have left such a blunder on his page. I'll check it out, but in the meantime, keep looking, cause this is bogus. OK, the page has three different tubes shown, including the 8045, which does *not* look like a G2 driven beam tube. Ignore my previous comments about rebasing sweep tubes and keep looking. May still have been the rebasing of conventional audio tubes. For a push-pull plate load of 3600 ohms and idling dissipation of 40 watts, you'll probably want to go with the big bottles of the KT88/6550 family. Pin-out even looks like a plug in fit. But you'll need to check for any extra connections on the socket base pins. For the EL34 family you'll want to connect pin 1 to pin 8. Good fortune, Chris Hornbeck |
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#17
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On Tue, 7 Sep 2004 01:12:57 -0400, "Ken Platt"
wrote: Any suggestion of what news group to pose the question regarding the conversion? Email me a schematic and I can comment. Looks extremely straight- forward based on Ned's posted curves. If you have adjustable bias only the socket wiring need be checked. Piece-a-cake. Are you comfortable with soldering and the odd voltage measurement in the midst of high (deadly!) voltages? If so, you can do this yourself. If not, it's not a big deal for someone that does it often. Chris Hornbeck |
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#18
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On Tue, 7 Sep 2004 01:12:57 -0400, "Ken Platt"
wrote: Any suggestion of what news group to pose the question regarding the conversion? Email me a schematic and I can comment. Looks extremely straight- forward based on Ned's posted curves. If you have adjustable bias only the socket wiring need be checked. Piece-a-cake. Are you comfortable with soldering and the odd voltage measurement in the midst of high (deadly!) voltages? If so, you can do this yourself. If not, it's not a big deal for someone that does it often. Chris Hornbeck |
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#19
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"I Care" Phil Allison "I Care" = no you dont !! Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 ** Which is a ridiculous MISPRINT !! You are right!! I don't care for your uncalled for inflammatory comments, but I do care enough to try to help, even if it ends up the information provided to me was incorrect. ** You did not *care* enough to simply check the other numbers data on that **SAME** page. Common sense should have warned you that a specially made tube would not a have a common equivalent. Prove you care and help him find the tube he needs. ** Prove you are not an ass and do that yourself. Wild Goose chases are your forte. ............. Phil |
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#20
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"I Care" Phil Allison "I Care" = no you dont !! Google search led to he http://www.triodeel.com/tubedata.htm About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 ** Which is a ridiculous MISPRINT !! You are right!! I don't care for your uncalled for inflammatory comments, but I do care enough to try to help, even if it ends up the information provided to me was incorrect. ** You did not *care* enough to simply check the other numbers data on that **SAME** page. Common sense should have warned you that a specially made tube would not a have a common equivalent. Prove you care and help him find the tube he needs. ** Prove you are not an ass and do that yourself. Wild Goose chases are your forte. ............. Phil |
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#21
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"Ken Platt" Thanks for everyone's help so far. I had seen that same interchangable statement and had assumed it was false as well. Any suggestion of what news group to pose the question regarding the conversion? ** Ummmmm - how about RAT ??? ............ Phil |
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#22
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"Ken Platt" Thanks for everyone's help so far. I had seen that same interchangable statement and had assumed it was false as well. Any suggestion of what news group to pose the question regarding the conversion? ** Ummmmm - how about RAT ??? ............ Phil |
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#23
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#24
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#25
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"Mike Rivers" Phil Allison About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 ** Which is a ridiculous MISPRINT !! Hey! How come these guys get a "Misprint" and I'm always an "Idiot"? ** Proof of the difference waits below. If it's a misprint, you probably have some idea of what tube should have been listed as the alternate. ** See - idiots make asinine assumptions like the one Mike Rivers just did. Care to elucidate? ** And become besotted with them. Then want others to worship them too. ............ Phil |
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#26
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"Mike Rivers" Phil Allison About 2/3 down the page makes the statement below 6240G See 8045G, also see interchangeable type 6CG7/6FQ7 ** Which is a ridiculous MISPRINT !! Hey! How come these guys get a "Misprint" and I'm always an "Idiot"? ** Proof of the difference waits below. If it's a misprint, you probably have some idea of what tube should have been listed as the alternate. ** See - idiots make asinine assumptions like the one Mike Rivers just did. Care to elucidate? ** And become besotted with them. Then want others to worship them too. ............ Phil |
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#27
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On Tue, 7 Sep 2004 17:20:34 -0400, "Ken Platt"
wrote: Not a bad suggestion Norm. But the guy who gave it 2 us thought it 'needed to be used.' Still looking for info on the mod for diff tubes Hi Ken, Received your schematic, and it looks extremely straightforward. There's plenty of bias voltage available, small cathode resistors to check and adjust bias, and reasonable voltages and load impedance for KT88/6550 family tubes. When you examine the output tube sockets, confirm that no pins are used as convenient tie points for something else. If so, move them. Then connect about 100 ohm, a couple watt resistors from pins 3 to 4. With no output tubes installed, fire it up (preferably with a Variac, but *SAFETY FIRST* in any case - allow no children or pets in the room). Observe voltages at points marked "C1" and C2". Adjust the 30K ohm bias pots for maximum voltage. Power off. Observe all supply voltages and wait until they've fallen to a low level, maybe a coupla volts. Install your new matched quad of Svetlana or maybe JJ power tubes. Fire it up again and observe. Everything OK? Bias is measured at the cathode pins (pin 8). I'd run modern tubes at between 50 and 70 mA (500 mV and 700mV on pin 8). The 10K ohm pots are to balance the current in each pair. Try various bias currents and use the least that doesn't affect sound quality. And no more than 80mA. Good fortune, Chris Hornbeck |
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#28
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On Tue, 7 Sep 2004 17:20:34 -0400, "Ken Platt"
wrote: Not a bad suggestion Norm. But the guy who gave it 2 us thought it 'needed to be used.' Still looking for info on the mod for diff tubes Hi Ken, Received your schematic, and it looks extremely straightforward. There's plenty of bias voltage available, small cathode resistors to check and adjust bias, and reasonable voltages and load impedance for KT88/6550 family tubes. When you examine the output tube sockets, confirm that no pins are used as convenient tie points for something else. If so, move them. Then connect about 100 ohm, a couple watt resistors from pins 3 to 4. With no output tubes installed, fire it up (preferably with a Variac, but *SAFETY FIRST* in any case - allow no children or pets in the room). Observe voltages at points marked "C1" and C2". Adjust the 30K ohm bias pots for maximum voltage. Power off. Observe all supply voltages and wait until they've fallen to a low level, maybe a coupla volts. Install your new matched quad of Svetlana or maybe JJ power tubes. Fire it up again and observe. Everything OK? Bias is measured at the cathode pins (pin 8). I'd run modern tubes at between 50 and 70 mA (500 mV and 700mV on pin 8). The 10K ohm pots are to balance the current in each pair. Try various bias currents and use the least that doesn't affect sound quality. And no more than 80mA. Good fortune, Chris Hornbeck |
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#29
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On Mon, 06 Sep 2004 16:43:03 +0000, Ken Platt wrote:
Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? AFAIK, an 8045G IS a 6550 wired as a triode (by jumpers in the base). See: http://www.triodeel.com/images/8045.gif Most of the "8045G" labelled tubes I've seen were US made 6550's with jumpers added in the base. This may be a difficult and expensive change, though less expensive than finding new 8045Gs. Wiring the socket for a 6550 or KT88 is not difficult, nor should it be expensive. -- Ned Carlson Triode Electronics Chicago,IL USA www.triodeelectronics.com |
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#30
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On Mon, 06 Sep 2004 16:43:03 +0000, Ken Platt wrote:
Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? AFAIK, an 8045G IS a 6550 wired as a triode (by jumpers in the base). See: http://www.triodeel.com/images/8045.gif Most of the "8045G" labelled tubes I've seen were US made 6550's with jumpers added in the base. This may be a difficult and expensive change, though less expensive than finding new 8045Gs. Wiring the socket for a 6550 or KT88 is not difficult, nor should it be expensive. -- Ned Carlson Triode Electronics Chicago,IL USA www.triodeelectronics.com |
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#31
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"François Yves Le Gal" wrote in message
... On 12 Sep 2004 03:53:16 -0500, "Ned Carlson" wrote: AFAIK, an 8045G IS a 6550 wired as a triode (by jumpers in the base). See: http://www.triodeel.com/images/8045.gif Most of the "8045G" labelled tubes I've seen were US made 6550's with jumpers added in the base. If a very large number of so-called 8045G's were "modified" tetrodes, the real McCoy was a native triode, developped at the request of Tim de Paravicini, then star designer at Lux, by NEC. With a very differently-shaped envelope, resembling some transmitting tubes. Peace, Paul |
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#32
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Paul Stamler wrote:
"François Yves Le Gal" wrote in message ... On 12 Sep 2004 03:53:16 -0500, "Ned Carlson" wrote: AFAIK, an 8045G IS a 6550 wired as a triode (by jumpers in the base). See: http://www.triodeel.com/images/8045.gif Most of the "8045G" labelled tubes I've seen were US made 6550's with jumpers added in the base. If a very large number of so-called 8045G's were "modified" tetrodes, the real McCoy was a native triode, developped at the request of Tim de Paravicini, then star designer at Lux, by NEC. With a very differently-shaped envelope, resembling some transmitting tubes. Peace, Paul Lots of 6550's available at various prices here. Nothing on the 8045G. http://www.tubesandmore.com/ -- Art Jackson W4TOY Owensboro, KY USA Life is God's open book test. In order to pass, you must open His book to find the answers. |
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#33
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Ken Platt wrote:
Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? *8045G--power triode, made in Japan by NEC especially for a 1970s-model Luxman amplifier. Long out of production, scarce and expensive. Unlikely to be manufactured again. There may have been a version marketed by Golden Dragon recently. We recommend having the amplifier modified to accept a triode-connected EL34 or KT88. This may be a difficult and expensive change, though less expensive than finding new 8045Gs. Please consult with an experienced service technician.* Thanks, Ken Hi Ken Very easy to change to KT88. I would not consider El34's |
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#34
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Ken Platt wrote:
Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? *8045G--power triode, made in Japan by NEC especially for a 1970s-model Luxman amplifier. Long out of production, scarce and expensive. Unlikely to be manufactured again. There may have been a version marketed by Golden Dragon recently. We recommend having the amplifier modified to accept a triode-connected EL34 or KT88. This may be a difficult and expensive change, though less expensive than finding new 8045Gs. Please consult with an experienced service technician.* Thanks, Ken Hi Ken Very easy to change to KT88. I would not consider El34's |
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#35
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In article ,
Philip Lawrence wrote: Ken Platt wrote: Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? *8045G--power triode, made in Japan by NEC especially for a 1970s-model Luxman amplifier. Long out of production, scarce and expensive. Unlikely to be manufactured again. There may have been a version marketed by Golden Dragon recently. We recommend having the amplifier modified to accept a triode-connected EL34 or KT88. This may be a difficult and expensive change, though less expensive than finding new 8045Gs. Please consult with an experienced service technician.* Thanks, Ken Hi Ken Very easy to change to KT88. I would not consider El34's Agreed, the KT88 change should be just addition of a jumper and rebiasing for the most part, and there should be no problems with mechanical fit. Permit me to recommend the Svetlana 6550C as a great inexpensive KT88-style tube. EL34 will require some big bias change and some loss of power. Not a huge problem, but they aren't really much cheaper than the 6550Cs anyway. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#36
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In article ,
Philip Lawrence wrote: Ken Platt wrote: Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? *8045G--power triode, made in Japan by NEC especially for a 1970s-model Luxman amplifier. Long out of production, scarce and expensive. Unlikely to be manufactured again. There may have been a version marketed by Golden Dragon recently. We recommend having the amplifier modified to accept a triode-connected EL34 or KT88. This may be a difficult and expensive change, though less expensive than finding new 8045Gs. Please consult with an experienced service technician.* Thanks, Ken Hi Ken Very easy to change to KT88. I would not consider El34's Agreed, the KT88 change should be just addition of a jumper and rebiasing for the most part, and there should be no problems with mechanical fit. Permit me to recommend the Svetlana 6550C as a great inexpensive KT88-style tube. EL34 will require some big bias change and some loss of power. Not a huge problem, but they aren't really much cheaper than the 6550Cs anyway. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#37
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Thanks for seconding that motion. I think I have decided to do the mod as
opposed to getting into more rare tubes. That said, can anyone recommend someone in the Hamilton ON or at least southern Ontario area who is qualified for such a mod. Barring any recommendations I will just ask my usual guitar (tube) amp guy. Thanks for everyone's help. ken "Scott Dorsey" wrote in message ... In article , Philip Lawrence wrote: Ken Platt wrote: Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? *8045G--power triode, made in Japan by NEC especially for a 1970s-model Luxman amplifier. Long out of production, scarce and expensive. Unlikely to be manufactured again. There may have been a version marketed by Golden Dragon recently. We recommend having the amplifier modified to accept a triode-connected EL34 or KT88. This may be a difficult and expensive change, though less expensive than finding new 8045Gs. Please consult with an experienced service technician.* Thanks, Ken Hi Ken Very easy to change to KT88. I would not consider El34's Agreed, the KT88 change should be just addition of a jumper and rebiasing for the most part, and there should be no problems with mechanical fit. Permit me to recommend the Svetlana 6550C as a great inexpensive KT88-style tube. EL34 will require some big bias change and some loss of power. Not a huge problem, but they aren't really much cheaper than the 6550Cs anyway. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#38
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Thanks for seconding that motion. I think I have decided to do the mod as
opposed to getting into more rare tubes. That said, can anyone recommend someone in the Hamilton ON or at least southern Ontario area who is qualified for such a mod. Barring any recommendations I will just ask my usual guitar (tube) amp guy. Thanks for everyone's help. ken "Scott Dorsey" wrote in message ... In article , Philip Lawrence wrote: Ken Platt wrote: Someone recently gave me a Lux MQ3600 power amp. Unfortunately there is one 8045G power tube missing. Finding one seems impossible by my search. Does anyone have a source for them? Beyond that, has anyone done the mod described below and want to comment on the expense and/or result? *8045G--power triode, made in Japan by NEC especially for a 1970s-model Luxman amplifier. Long out of production, scarce and expensive. Unlikely to be manufactured again. There may have been a version marketed by Golden Dragon recently. We recommend having the amplifier modified to accept a triode-connected EL34 or KT88. This may be a difficult and expensive change, though less expensive than finding new 8045Gs. Please consult with an experienced service technician.* Thanks, Ken Hi Ken Very easy to change to KT88. I would not consider El34's Agreed, the KT88 change should be just addition of a jumper and rebiasing for the most part, and there should be no problems with mechanical fit. Permit me to recommend the Svetlana 6550C as a great inexpensive KT88-style tube. EL34 will require some big bias change and some loss of power. Not a huge problem, but they aren't really much cheaper than the 6550Cs anyway. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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