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#1
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6EU7 To a 12AX7
I have a SET amp with 6EU7 preamps. From tube characteristic
charts it appears a 12AX7 is identical except for socket wiring and the filiment is center tapped. Does anyone know of a reason to keep the rarer 6EU7 instead of rewiring the sockets to 12AX7? Thanks! |
#2
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François Yves Le Gal wrote: On Sun, 24 Apr 2005 08:39:24 -0400, MikeWall wrote: From tube characteristic charts it appears a 12AX7 is identical It's close, but not identical: the 6EU7 has slightly more gain, 100 vs. 90 for the 12AX7, which also whows a better dissipation. Anyway, you can use a 12AX7 in a circuit designed for the 6EU7 (with the mods you've mentioned, of course). Froggy's fulla ****. Froggy needs a new specbook. The RCA Tube Handbook (HB-3) shows *identical* specs (inclucing all of the curves) for these two devices, with the exception of two *very* minor deviations in inter-element capacitance, i.e, 1.5pF vs. 1.7pF for grid-to-plate, and 0.2pF vs. 0.46pF for plate-to-cathode. Other than the filament system and the basing, they are the same. Amplification factor is 100 in either case. Commence whining, Froggy. Lord Valve American |
#3
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François Yves Le Gal wrote:
On Sun, 24 Apr 2005 17:24:31 GMT, Lord Valve wrote: Froggy's fulla ****. Froggy needs a new specbook. Bozo, next time I'll want your opinion, I'll spit at you. You can meanwhile get back to your corner chewing your toenails. Froggy, this is a real head-scratcher. It's seldom that we see even a third-rate clod like you **** on himself so thoroughly. Keep reading, schmuck... http://hereford.ampr.org/cgi-bin/tube?tube=6EU7 http://home.rochester.rr.com/piazza/...ubes/6eu7.html http://hereford.ampr.org/cgi-bin/tube?tube=12AX7 http://home.rochester.rr.com/piazza/...es/12ax7a.html Copied/pasted from the exact URLs YOU provided: _______________________________________________ 12AX7 ( http://hereford.ampr.org/cgi-bin/tube?tube=12AX7 ) Heater Characteristics Heater Voltage ................................ 6.3/12.6 Volts Heater Current ................................ 0.3/0.15 Amperes Direct Interelectrode Capacitances (approx) Each Triode Input ......................................... 1.8 pf Output ........................................ 1.9 pf Grid to Plate ................................. 1.7 pf Maximum Ratings (Design Center Values) Each Triode Plate Voltage ................................. 330 Volts Plate Dissipation ............................. 1.2 Watts Characteristics and Typical Operation Class A Amplifier Plate Voltage ................................. 250 Volts Grid No. 1 Voltage ............................ -2 Volts Amplification Factor .......................... 100 Plate Resistance (approx) ..................... 62.5K Ohms Transconductance .............................. 1600 MicroMhos Plate Current (Zero Signal) ................... 1.2 Ma. For other characteristics and typical operation, see 12AX7A ------------------------------------------------------------------------------------------- 6EU7 ( http://hereford.ampr.org/cgi-bin/tube?tube=6EU7 ) Heater Characteristics Heater Voltage ................................ 6.3 Volts Heater Current ................................ 0.3 Amperes Direct Interelectrode Capacitances (approx) Each Triode Input ......................................... 1.6 pf Output ........................................ 0.2 pf Grid to Plate ................................. 1.5 pf Maximum Ratings (Design Center Values) Each Triode Plate Voltage ................................. 330 Volts Plate Dissipation ............................. 1.2 Watts Characteristics and Typical Operation Class A Amplifier Plate Voltage ................................. 250 Volts Grid No. 1 Voltage ............................ -2 Volts Amplification Factor .......................... 100 Plate Resistance (approx) ..................... 62.5K Ohms Transconductance .............................. 1600 MicroMhos Plate Current (Zero Signal) ................... 1.2 Ma. _________________________________________________ Thank you for giving me the opportunity to publicly humiliate you, sack'o ****. You really love to be bitch slapped, don't you? Um, humiliation - OK, Froggy... If "humiliation" consists of data from URLs supplied by you which absolutely support me in every way, then I guess I'm humiliated. I'm not sure on exactly which planet that occurred, but I'm pretty certain it wasn't this one. Do we need to see this again, in case anyone missed it? 12AX7 Class A Amplifier Plate Voltage ................................. 250 Volts Grid No. 1 Voltage ............................ -2 Volts Amplification Factor .......................... 100 Plate Resistance (approx) ..................... 62.5K Ohms Transconductance .............................. 1600 MicroMhos Plate Current (Zero Signal) ................... 1.2 Ma. 6EU7 Class A Amplifier Plate Voltage ................................. 250 Volts Grid No. 1 Voltage ............................ -2 Volts Amplification Factor .......................... 100 Plate Resistance (approx) ..................... 62.5K Ohms Transconductance .............................. 1600 MicroMhos Plate Current (Zero Signal) ................... 1.2 Ma. Those are copied right off the URLs you supplied, Froggy. Damn, that must sting. There, there. There, there. BTW, where are the proofs of your former allegations regarding New Sensor owning Reflektor, dickhead? Ask Mike yourself, Froggy. 1-800-633-5477. Or ask Ralph Trimarchi. Tell either of 'em Lord Valve sent you. Thanks for playing - better luck next time. Lord Valve Expert |
#4
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MikeWall wrote: I have a SET amp with 6EU7 preamps. From tube characteristic charts it appears a 12AX7 is identical except for socket wiring and the filiment is center tapped. Does anyone know of a reason to keep the rarer 6EU7 instead of rewiring the sockets to 12AX7? Thanks! Thanks I didn't mean to be a point of contention for anyone. 90 or 100 they look verry close to me . |
#5
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What do you mean by componet dispersion? I've never heard the term in
Vacuum Tube technology. THANKS! François Yves Le Gal wrote: On Sun, 24 Apr 2005 15:56:18 -0400, stuhawk wrote: Thanks I didn't mean to be a point of contention for anyone. Don't worry, "Lord Valve" is one of our resident bigoted shrills. Every village has an idiot, the Internet is a global village: he's a global idiot. 90 or 100 they look verry close to me . It is very close: actual component dispersion will show a much better difference ! |
#6
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From memory the 6EU7 is a 12AX7 with different basing to make wiring
easier in production and more hum-free (although no serious constructor today would run AC filaments on small signal tubes IMO). YMMV because the tube manuals were all different and will quote slightly different values for a variety of reasons. |
#7
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Here, Froggy - eat these:
http://www.pmillett.com/tubedata/HB-...02/12AX7-A.PDF (RCA HB-3, 1960) http://www.mif.pg.gda.pl/homepages/f...3/1/12AX7A.pdf (GE datasheet, 1963) http://www.mif.pg.gda.pl/homepages/f...0/1/12AX7A.pdf (Mazda datasheet, 1968) http://www.mif.pg.gda.pl/homepages/f...7/1/12AX7A.pdf (Tung-Sol datasheet, 1965) http://hereford.ampr.org/cgi-bin/tube?tube=6AV6 ("for other characterists" link, RCA RC-29, 1975) http://www.drtube.com/datasheets/ecc83ph54.pdf (Philips datasheet, 1954) http://www.drtube.com/datasheets/ecc83tel54.pdf (Telefunken datasheet, 1954) http://www.drtube.com/datasheets/ecc83rft56.pdf (RFT datasheet, 1956) http://www.drtube.com/datasheets/ecc83ph70.pdf (Philips datasheet, 1970) http://www.jj-electronic.com/tube_ecc83.htm (JJ datasheet, current) http://www.eierc.com/rc/ECC83.htm (EI datasheet, current) http://www.drtube.com/datasheets/e83cclor62.pdf (Lorenz datasheet, 1962) http://www.drtube.com/datasheets/12ax7syl55.pdf (Sylvania datasheet, 1955) http://www.drtube.com/datasheets/12ax7rca62.pdf (RCA datasheet, 1962) http://www.drtube.com/datasheets/7025rca59.pdf (RCA datasheet, 1959) http://hereford.ampr.org/cgi-bin/tube?tube=12AX7 etc. Every single one of 'em says "Amplification Factor = 100." You posted a link to a datasheet with bogus data on it. You're busted, Froggy. Crawl back into the primordial French ooze from which you were so recently excreted and cease spreading your putrescence here. Lord Valve Expert François Yves Le Gal wrote: On Sun, 24 Apr 2005 18:32:31 GMT, Lord Valve wrote: Froggy, this is a real head-scratcher. Then remove your fingers from your big fat hairy ass, ****head. It's seldom that we see even a third-rate clod like you **** on himself so thoroughly. Keep reading, schmuck... http://home.rochester.rr.com/piazza/...ubes/6eu7.html 6EU7 HIGH-MU TWIN TRIODE Miniature type used in high gain, resistance-coupled low-level audio-amplifier applications where low hum and non-microphonic characteristics are important. Requires miniature 9-contact socket. [...] Amplification Factor 100 http://home.rochester.rr.com/piazza/...es/12ax7a.html 12AX7A HIGH-MU TWIN TRIODE Miniature type used as phase inverters or twin resistance- coupled amplifiers in radio and audio equipment. Requires miniature 9-contact socket. Each triode unit is independent of the other except for the common heater. [...] Amplification Factor 90 Copied/pasted from the exact URLs YOU provided: That's what I just did above, sack'o ****. You've been bitch slapped, again. Oh, and alt.asshole.factory isn't a valid newsgroup. Maybe it's your business adress? BTW, you still haven't proven anything regarding Reflektor. Except of of course that you're a moronic ****head. But we already knew that... BTW, FU2 again. Oh, and your handle "detritus" is perfect. |
#8
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sigh
Froggy, you're just wrong. You know it, I know it, and all the rest of the chicken**** losers on RAT who are giving this litle spat wide berth know it. Amplification factor on a 12AX7 is 100 - has been for years, will be until it short-dicks every cannibal on the Congo. You haven't come up with a single ref other than the incorrect one you posted the original link to, and you won't, because there aren't any. Even the *other* 12AX7 link *you* posted says so - but you didn't read it in the first place, you just assumed it would back up the incorrect one. So, by all means - continue to look like an ass. You wear it well. Lord Valve Expert François Yves Le Gal wrote: On Mon, 25 Apr 2005 03:55:33 GMT, Lord Valve wrote: Here, Froggy - eat these: Want another round, ****head? OK, here we go... http://www.pmillett.com/tubedata/HB-...02/12AX7-A.PDF (RCA HB-3, 1960) http://www.mif.pg.gda.pl/homepages/f...3/1/12AX7A.pdf (GE datasheet, 1963) http://www.mif.pg.gda.pl/homepages/f...0/1/12AX7A.pdf (Mazda datasheet, 1968) http://www.mif.pg.gda.pl/homepages/f...7/1/12AX7A.pdf (Tung-Sol datasheet, 1965) 12AX7A, not 12AX7 http://hereford.ampr.org/cgi-bin/tube?tube=6AV6 ("for other characterists" link, RCA RC-29, 1975) 6AV6 http://www.drtube.com/datasheets/ecc83ph54.pdf (Philips datasheet, 1954) http://www.drtube.com/datasheets/ecc83tel54.pdf (Telefunken datasheet, 1954) http://www.drtube.com/datasheets/ecc83rft56.pdf (RFT datasheet, 1956) http://www.drtube.com/datasheets/ecc83ph70.pdf (Philips datasheet, 1970) http://www.jj-electronic.com/tube_ecc83.htm (JJ datasheet, current)a http://www.eierc.com/rc/ECC83.htm (EI datasheet, current) http://www.drtube.com/datasheets/e83cclor62.pdf (Lorenz datasheet, 1962) ECC83 Yeah, sure... SNIP the rest of your rant. Thank you for letting me bitch slap you again, dickless loser. You may now climb back on your special needs tricycle, the one with a fourth wheel added for extra safety, and pedal back to your trailer. |
#10
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Subject:
6EU7 To a 12AX7 Date: Mon, 25 Apr 2005 00:54:36 GMT From: robert casey Organization: EarthLink Inc. -- http://www.EarthLink.net Newsgroups: junk References: 1 , 2 , 3 , 4 , 5 , 6 [...] Amplification Factor 90 And we all know that all web sites are error free.... ....especially the ones Froggy hangs out on. Make sure you check the followup setting on anything Froggy posts here. Froggy stepped in something, and he's trying to cover his tracks. Lord Valve Expert |
#11
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Lord Valve wrote:
Fran=E7ois Yves Le Gal wrote: On Sun, 24 Apr 2005 08:39:24 -0400, MikeWall wrot= e: From tube characteristic charts it appears a 12AX7 is identical It's close, but not identical: the 6EU7 has slightly more gain, 100 v= s. 90 for the 12AX7, which also whows a better dissipation. Anyway, you can= use a 12AX7 in a circuit designed for the 6EU7 (with the mods you've mentio= ned, of course). Froggy's fulla ****. Froggy needs a new specbook. The RCA Tube Handbook (HB-3) shows *identical* specs (inclucing all of the curves) for these two devices, with the exception of two *very* minor deviations in inter-element capacitance, i.e, 1.5pF vs. 1.7pF for grid-to-plate, and 0.2pF vs. 0.46pF for plate-to-cathode. Other than the filament system and the basing, they are the same. Amplification factor is 100 in either case. Commence whining, Froggy. Lord Valve American Most of the RCA HB's give only average data. The 12AX7 Mu varies from 90 = to 105, depending on operating conditions. MU is not a constant. JLS |
#12
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Lord Valve wrote:
François Yves Le Gal wrote: On Sun, 24 Apr 2005 08:39:24 -0400, MikeWall wrote: From tube characteristic charts it appears a 12AX7 is identical It's close, but not identical: the 6EU7 has slightly more gain, 100 vs. 90 for the 12AX7, which also whows a better dissipation. Anyway, you canuse a 12AX7 in a circuit designed for the 6EU7 (with the mods you've mentioned, of course). Froggy's fulla ****. Froggy needs a new specbook. The RCA Tube Handbook (HB-3) shows *identical* specs (inclucing all of the curves) for these two devices, with the exception of two *very* minor deviations in inter-element capacitance, i.e, 1.5pF vs. 1.7pF for grid-to-plate, and 0.2pF vs. 0.46pF for plate-to-cathode. Other than the filament system and the basing, they are the same. Amplification factor is 100 in either case. Commence whining, Froggy. Lord Valve American Most of the RCA HB's give only average data. The 12AX7 MU varies from 90 to 105, depending on operating conditions. MU is not a constant. JLS See at http://frank.pocnet.net/sheets/127/1/12AX7A.pdf |
#13
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in article , Lord Valve at
wrote on 4/25/05 12:54 PM: Subject: 6EU7 To a 12AX7 Date: Sun, 24 Apr 2005 14:18:34 -0400 From: Jon Yaeger Organization: BellSouth Internet Group Newsgroups: junk References: 1 , 2 , 3 , 4 Indeed you are. You missed that fact that Froggy set followups to "junk" so that in case anyone besides me caught him bull****ting the post wouldn't show up on RAT. Froggy's chicken****. Lord Valve Expert How can he do that?? I posted a very benign reply, and it doesn't show up. Jon |
#14
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John Stewart wrote: Lord Valve wrote: François Yves Le Gal wrote: On Sun, 24 Apr 2005 08:39:24 -0400, MikeWall wrote: From tube characteristic charts it appears a 12AX7 is identical It's close, but not identical: the 6EU7 has slightly more gain, 100 vs. 90 for the 12AX7, which also whows a better dissipation. Anyway, you can use a 12AX7 in a circuit designed for the 6EU7 (with the mods you've mentioned, of course). Froggy's fulla ****. Froggy needs a new specbook. The RCA Tube Handbook (HB-3) shows *identical* specs (inclucing all of the curves) for these two devices, with the exception of two *very* minor deviations in inter-element capacitance, i.e, 1.5pF vs. 1.7pF for grid-to-plate, and 0.2pF vs. 0.46pF for plate-to-cathode. Other than the filament system and the basing, they are the same. Amplification factor is 100 in either case. Commence whining, Froggy. Lord Valve American Most of the RCA HB's give only average data. The 12AX7 Mu varies from 90 to 105, depending on operating conditions. Depending on operating conditions, you can vary it much more widely than that. SPECS are what is being discussed here, and Froggy has posted a link to a page which shows a spec not listed on any other datasheet or manual. MU is not a constant. No ****. LV |
#15
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Jon Yaeger wrote: in article , Lord Valve at wrote on 4/25/05 12:54 PM: Subject: 6EU7 To a 12AX7 Date: Sun, 24 Apr 2005 14:18:34 -0400 From: Jon Yaeger Organization: BellSouth Internet Group Newsgroups: junk References: 1 , 2 , 3 , 4 Indeed you are. You missed that fact that Froggy set followups to "junk" so that in case anyone besides me caught him bull****ting the post wouldn't show up on RAT. Froggy's chicken****. Lord Valve Expert How can he do that?? Anyone can do it. Almost no-one does, because it's rude. Of course, he *is* French... I posted a very benign reply, and it doesn't show up. When you click your "reply to group" icon, check what group comes up in the "to" field. If it's not he one you thought you were replying to, just erase it and type the right one in. It's just Froggy's snotty little way of making you jump through an extra hoop before you can debunk his crap. LV |
#16
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Lord Valve wrote in
: .... will be until it short-dicks every cannibal on the Congo.... That's what's so awesome about lurking this group. Something new to learn every day! |
#17
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Lord Valve wrote: Here, Froggy - eat these: http://www.pmillett.com/tubedata/HB-...02/12AX7-A.PDF (RCA HB-3, 1960) http://www.mif.pg.gda.pl/homepages/f...3/1/12AX7A.pdf (GE datasheet, 1963) http://www.mif.pg.gda.pl/homepages/f...0/1/12AX7A.pdf (Mazda datasheet, 1968) http://www.mif.pg.gda.pl/homepages/f...7/1/12AX7A.pdf (Tung-Sol datasheet, 1965) http://hereford.ampr.org/cgi-bin/tube?tube=6AV6 ("for other characterists" link, RCA RC-29, 1975) http://www.drtube.com/datasheets/ecc83ph54.pdf (Philips datasheet, 1954) http://www.drtube.com/datasheets/ecc83tel54.pdf (Telefunken datasheet, 1954) http://www.drtube.com/datasheets/ecc83rft56.pdf (RFT datasheet, 1956) http://www.drtube.com/datasheets/ecc83ph70.pdf (Philips datasheet, 1970) http://www.jj-electronic.com/tube_ecc83.htm (JJ datasheet, current) http://www.eierc.com/rc/ECC83.htm (EI datasheet, current) http://www.drtube.com/datasheets/e83cclor62.pdf (Lorenz datasheet, 1962) http://www.drtube.com/datasheets/12ax7syl55.pdf (Sylvania datasheet, 1955) http://www.drtube.com/datasheets/12ax7rca62.pdf (RCA datasheet, 1962) http://www.drtube.com/datasheets/7025rca59.pdf (RCA datasheet, 1959) http://hereford.ampr.org/cgi-bin/tube?tube=12AX7 etc. Every single one of 'em says "Amplification Factor = 100." You posted a link to a datasheet with bogus data on it. You're busted, Froggy. Crawl back into the primordial French ooze from which you were so recently excreted and cease spreading your putrescence here. Lord Valve Expert The French man's web reference is as follows for 6EU7:- """""" Miniature type used in high gain, resistance-coupled low-level audio-amplifier applications where low hum and non-microphonic characteristics are important. Requires miniature 9-contact socket. Heater Voltage (ac/dc): .................................................. ............. 6.3 volts Heater Current: .................................................. .................. 0.30 amperes Class A1 Amplifier (Each Unit) Maximum Ratings (Design-Center Values) Plate Voltage .................................................. ............................... 330 volts Grid Voltage (Negative-bias value) ............................................ 55 volts Grid Voltage (Positive-bias value) ................................................ 0 volts Plate Dissipation .................................................. ......................... 1.2 watts Amplification Factor .................................................. ............................ 100 """""" Now, all I see is µ = 100. What is bogus about this? Patrick Turner. François Yves Le Gal wrote: On Sun, 24 Apr 2005 18:32:31 GMT, Lord Valve wrote: Froggy, this is a real head-scratcher. Then remove your fingers from your big fat hairy ass, ****head. It's seldom that we see even a third-rate clod like you **** on himself so thoroughly. Keep reading, schmuck... http://home.rochester.rr.com/piazza/...ubes/6eu7.html 6EU7 HIGH-MU TWIN TRIODE Miniature type used in high gain, resistance-coupled low-level audio-amplifier applications where low hum and non-microphonic characteristics are important. Requires miniature 9-contact socket. [...] Amplification Factor 100 http://home.rochester.rr.com/piazza/...es/12ax7a.html 12AX7A HIGH-MU TWIN TRIODE Miniature type used as phase inverters or twin resistance- coupled amplifiers in radio and audio equipment. Requires miniature 9-contact socket. Each triode unit is independent of the other except for the common heater. [...] Amplification Factor 90 Copied/pasted from the exact URLs YOU provided: That's what I just did above, sack'o ****. You've been bitch slapped, again. Oh, and alt.asshole.factory isn't a valid newsgroup. Maybe it's your business adress? BTW, you still haven't proven anything regarding Reflektor. Except of of course that you're a moronic ****head. But we already knew that... BTW, FU2 again. Oh, and your handle "detritus" is perfect. |
#18
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Lord Valve wrote: sigh Froggy, you're just wrong. You know it, I know it, and all the rest of the chicken**** losers on RAT who are giving this litle spat wide berth know it. Amplification factor on a 12AX7 is 100 - has been for years, will be until it short-dicks every cannibal on the Congo. You haven't come up with a single ref other than the incorrect one you posted the original link to, and you won't, because there aren't any. Even the *other* 12AX7 link *you* posted says so - but you didn't read it in the first place, you just assumed it would back up the incorrect one. So, by all means - continue to look like an ass. You wear it well. Lord Valve Expert Not every 12AX7 has a measured µ of 100..... Patrick Turner. François Yves Le Gal wrote: On Mon, 25 Apr 2005 03:55:33 GMT, Lord Valve wrote: Here, Froggy - eat these: Want another round, ****head? OK, here we go... http://www.pmillett.com/tubedata/HB-...02/12AX7-A.PDF (RCA HB-3, 1960) http://www.mif.pg.gda.pl/homepages/f...3/1/12AX7A.pdf (GE datasheet, 1963) http://www.mif.pg.gda.pl/homepages/f...0/1/12AX7A.pdf (Mazda datasheet, 1968) http://www.mif.pg.gda.pl/homepages/f...7/1/12AX7A.pdf (Tung-Sol datasheet, 1965) 12AX7A, not 12AX7 http://hereford.ampr.org/cgi-bin/tube?tube=6AV6 ("for other characterists" link, RCA RC-29, 1975) 6AV6 http://www.drtube.com/datasheets/ecc83ph54.pdf (Philips datasheet, 1954) http://www.drtube.com/datasheets/ecc83tel54.pdf (Telefunken datasheet, 1954) http://www.drtube.com/datasheets/ecc83rft56.pdf (RFT datasheet, 1956) http://www.drtube.com/datasheets/ecc83ph70.pdf (Philips datasheet, 1970) http://www.jj-electronic.com/tube_ecc83.htm (JJ datasheet, current)a http://www.eierc.com/rc/ECC83.htm (EI datasheet, current) http://www.drtube.com/datasheets/e83cclor62.pdf (Lorenz datasheet, 1962) ECC83 Yeah, sure... SNIP the rest of your rant. Thank you for letting me bitch slap you again, dickless loser. You may now climb back on your special needs tricycle, the one with a fourth wheel added for extra safety, and pedal back to your trailer. |
#19
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Patrick Turner wrote: Lord Valve wrote: Here, Froggy - eat these: http://www.pmillett.com/tubedata/HB-...02/12AX7-A.PDF (RCA HB-3, 1960) http://www.mif.pg.gda.pl/homepages/f...3/1/12AX7A.pdf (GE datasheet, 1963) http://www.mif.pg.gda.pl/homepages/f...0/1/12AX7A.pdf (Mazda datasheet, 1968) http://www.mif.pg.gda.pl/homepages/f...7/1/12AX7A.pdf (Tung-Sol datasheet, 1965) http://hereford.ampr.org/cgi-bin/tube?tube=6AV6 ("for other characterists" link, RCA RC-29, 1975) http://www.drtube.com/datasheets/ecc83ph54.pdf (Philips datasheet, 1954) http://www.drtube.com/datasheets/ecc83tel54.pdf (Telefunken datasheet, 1954) http://www.drtube.com/datasheets/ecc83rft56.pdf (RFT datasheet, 1956) http://www.drtube.com/datasheets/ecc83ph70.pdf (Philips datasheet, 1970) http://www.jj-electronic.com/tube_ecc83.htm (JJ datasheet, current) http://www.eierc.com/rc/ECC83.htm (EI datasheet, current) http://www.drtube.com/datasheets/e83cclor62.pdf (Lorenz datasheet, 1962) http://www.drtube.com/datasheets/12ax7syl55.pdf (Sylvania datasheet, 1955) http://www.drtube.com/datasheets/12ax7rca62.pdf (RCA datasheet, 1962) http://www.drtube.com/datasheets/7025rca59.pdf (RCA datasheet, 1959) http://hereford.ampr.org/cgi-bin/tube?tube=12AX7 etc. Every single one of 'em says "Amplification Factor = 100." You posted a link to a datasheet with bogus data on it. You're busted, Froggy. Crawl back into the primordial French ooze from which you were so recently excreted and cease spreading your putrescence here. Lord Valve Expert The French man's web reference is as follows for 6EU7:- """""" Miniature type used in high gain, resistance-coupled low-level audio-amplifier applications where low hum and non-microphonic characteristics are important. Requires miniature 9-contact socket. Heater Voltage (ac/dc): .................................................. ............ 6.3 volts Heater Current: .................................................. ................. 0.30 amperes Class A1 Amplifier (Each Unit) Maximum Ratings (Design-Center Values) Plate Voltage .................................................. .............................. 330 volts Grid Voltage (Negative-bias value) ........................................... 55 volts Grid Voltage (Positive-bias value) ............................................... 0 volts Plate Dissipation .................................................. ........................ 1.2 watts Amplification Factor .................................................. ........................... 100 """""" Now, all I see is µ = 100. What is bogus about this? Patrick Turner. ROFLMBFAO! Ask Froggy. After all, HE posted it. He also posted a link to another page (evidently made up by a dude who specializes in re-drawing old Ampeg schematics, for some reason) which shows the amplification factor for a 12AX7 as 90. *Every* datasheet from *every* major specbook shows 100, but Froggy has his undies in a bunch about it. Ribbet, ribbet, ribbet - SQUASH. Lord Valve American |
#20
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On Tue, 26 Apr 2005 19:09:54 +0200, François Yves Le Gal
wrote: On Tue, 26 Apr 2005 16:45:29 GMT, Lord Valve wrote: Ribbet, ribbet, ribbet - SQUASH. In your dreams, Neutered Loser. Have you hugged your Karl Rowe love doll today? You lost the argument, dude. |
#21
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Lord Valve wrote: Patrick Turner wrote: Lord Valve wrote: Here, Froggy - eat these: http://www.pmillett.com/tubedata/HB-...02/12AX7-A.PDF (RCA HB-3, 1960) http://www.mif.pg.gda.pl/homepages/f...3/1/12AX7A.pdf (GE datasheet, 1963) http://www.mif.pg.gda.pl/homepages/f...0/1/12AX7A.pdf (Mazda datasheet, 1968) http://www.mif.pg.gda.pl/homepages/f...7/1/12AX7A.pdf (Tung-Sol datasheet, 1965) http://hereford.ampr.org/cgi-bin/tube?tube=6AV6 ("for other characterists" link, RCA RC-29, 1975) http://www.drtube.com/datasheets/ecc83ph54.pdf (Philips datasheet, 1954) http://www.drtube.com/datasheets/ecc83tel54.pdf (Telefunken datasheet, 1954) http://www.drtube.com/datasheets/ecc83rft56.pdf (RFT datasheet, 1956) http://www.drtube.com/datasheets/ecc83ph70.pdf (Philips datasheet, 1970) http://www.jj-electronic.com/tube_ecc83.htm (JJ datasheet, current) http://www.eierc.com/rc/ECC83.htm (EI datasheet, current) http://www.drtube.com/datasheets/e83cclor62.pdf (Lorenz datasheet, 1962) http://www.drtube.com/datasheets/12ax7syl55.pdf (Sylvania datasheet, 1955) http://www.drtube.com/datasheets/12ax7rca62.pdf (RCA datasheet, 1962) http://www.drtube.com/datasheets/7025rca59.pdf (RCA datasheet, 1959) http://hereford.ampr.org/cgi-bin/tube?tube=12AX7 etc. Every single one of 'em says "Amplification Factor = 100." You posted a link to a datasheet with bogus data on it. You're busted, Froggy. Crawl back into the primordial French ooze from which you were so recently excreted and cease spreading your putrescence here. Lord Valve Expert The French man's web reference is as follows for 6EU7:- """""" Miniature type used in high gain, resistance-coupled low-level audio-amplifier applications where low hum and non-microphonic characteristics are important. Requires miniature 9-contact socket. Heater Voltage (ac/dc): .................................................. ............ 6.3 volts Heater Current: .................................................. ................. 0.30 amperes Class A1 Amplifier (Each Unit) Maximum Ratings (Design-Center Values) Plate Voltage .................................................. .............................. 330 volts Grid Voltage (Negative-bias value) ........................................... 55 volts Grid Voltage (Positive-bias value) ............................................... 0 volts Plate Dissipation .................................................. ........................ 1.2 watts Amplification Factor .................................................. ........................... 100 """""" Now, all I see is µ = 100. What is bogus about this? Patrick Turner. ROFLMBFAO! Ask Froggy. After all, HE posted it. He also posted a link to another page (evidently made up by a dude who specializes in re-drawing old Ampeg schematics, for some reason) which shows the amplification factor for a 12AX7 as 90. *Every* datasheet from *every* major specbook shows 100, but Froggy has his undies in a bunch about it. Ribbet, ribbet, ribbet - SQUASH. In Northern Oz the Cane toads which are highly poisenous imported pests from Sth America grow to a size of a large fat cat. They like to use the road system to migrate and after being introduced to Qld cane farms to control insect pests, thay have bred and spread unchecked across thousands of kilometers of wild places, killing the uninitiated wild life not use to the powerful toxin their bodies contain. They look like a good meal, but are the opposite. So ppl have fun mowing them down in their FWD. So frog squashing is appropriate up north, but one does have to hose the vehicle down after a long trip. If you think you have a frog problem with Yves, try venturing this way, I'll give yer fukkin frog fukkin problems. Most 12AX7 or 6EU7 actually have µ = 100, +/-5%, which is determined by the relative dimensions between cathode, grid and anode and the wire pitch of the helical grid winding. Usually there is less than 10% variation in µ regardless of whether the tube was made, since its easy to make a triode to get a certain value of µ. In actual fact variations of µ occur between samples..... Maybe your concerns are akin a texas tornado occuring in a coffee cup. Chill out, move on, and don't worry about the occasional frogatorial statement that's only 90% right. If travelling in our north, there is no law compelling ppl to run over cane toads. If you miss one, no law says you have to back up and try again. Patrick Turner. Lord Valve American |
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Patrick Turner wrote: Most 12AX7 or 6EU7 actually have µ = 100, +/-5%, which is determined by the relative dimensions between cathode, grid and anode and the wire pitch of the helical grid winding. Usually there is less than 10% variation in µ regardless of whether the tube was made, since its easy to make a triode to get a certain value of µ. So, going by what you just wrote, Froggy posted bad data, and gave bad advice based on it. In actual fact variations of µ occur between samples..... Maybe your concerns are akin a texas tornado occuring in a coffee cup. I don't give a **** about the actual mu. Froggy got busted posting bull****, and has been trying to wiggle out of it for several days now. Chill out, move on, and don't worry about the occasional frogatorial statement that's only 90% right. He was 100% wrong, and 110% full of Frog ****. Lord Valve American |
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On Sun, 24 Apr 2005 08:39:24 +0000, MikeWall wrote:
I have a SET amp with 6EU7 preamps. From tube characteristic charts it appears a 12AX7 is identical except for socket wiring and the filiment is center tapped. Does anyone know of a reason to keep the rarer 6EU7 instead of rewiring the sockets to 12AX7? Thanks! Decent NOS 6EU7 are usually cheaper than decent NOS 12AX7 (like, say the ECC803s that tubedepot only wants $700 for). If your preamp has AC filaments, you'd be better off sticking with 6EU7 as the whole purpose behind 6EU7 was to minimize filament hum pickup so OEM's wouldn't have to spend money on DC filament supplies. OTOH, there's an awful lot more selection of current production 12AX7 than 6EU7. -- Ned Carlson Triode Electronics Chicago,IL USA www.triodeelectronics.com |
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