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richwalters 5th June 2009 05:42 AM

6SN7 equivalents in B9A
The ECC82 has figures which are sim but audio performance is horrible.
Anyone come up with other B9A's with comparable 6SN7 performance ?


DigitalJunkie 5th June 2009 06:05 AM


Colt45 5th June 2009 06:26 AM

cg7, fq7.

dsavitsk 5th June 2009 06:35 AM

Re: 6SN7 equivalents in B9A

Originally posted by richwalters
but audio performance is horrible.

Oh, please -- maybe it isn't as good as some other tubes, but horrible? I bet in a blind test 12au7's and 6sn7's are indistinguishable to 99% of us.

Lingwendil 5th June 2009 06:38 AM


Originally posted by Colt45
cg7, fq7.
Ditto, they both are excellent tubes, the only complaint I have with them is the low gain, which isn't a deal breaker

If you can find them in 8 volt heater version they are often cheaper too!

richwalters 5th June 2009 06:54 AM

Sorry for that one... (I have to expect some backlash from avid users)...I simply just don't get on with the ECC82... perhaps historical or have grotty samples.....It does have a poor FFT spectrum.

DigitJ- Thanks for 6CG7....Ah!. I really should have realised this one.


dsavitsk 5th June 2009 06:57 AM

If you haven't seen it, John Atwood has a nice writeup of history and types at

m6tt 5th June 2009 05:05 PM

As many of us have discovered, most of the old tube manufacturers liked to reuse parts. If for instance your circuit required a high mu dual triode, and a low mu, 6sn7-like dual triode, you should consider using two dissimilar triodes. Some of them are remarkably similar to 6cg7 and 12at7 specifically. They seem to have been common plate & cathode structures to use for medium and higher mu purposes in lotsa TV tubes etc.

wa2ise 5th June 2009 06:05 PM


If you can find them in 8 volt heater version they are often cheaper too!
And if you have 12.6VAC available you can just use a rectifier diode in series with the heater (without any filter cap) and it will operate normally. Power is V^2/R, and the R is not the same, and with the unfiltered diode 1/2 (V^2/R)

(12^2)/2 = 72, and 8.4^2 = 71 which is close enough. I took out 0.6V from the 12.6V for the diode drop (which is not exactly the same as 12VAC, but for this purpose that can be ignored)

Wavebourn 5th June 2009 06:34 PM

6N1P was offered to designers as a replacement for obsolete 6N8S (6SN7 analog)

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