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 Post subject: 6J6 as a Preamp Tube?
PostPosted: Oct Sat 07, 2006 10:14 pm 
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Location: Bel Air, Maryland
There are lots of articles, etc. about 12AX7’s (different brands, etc.) and their variants (7025’s, 5751’s, ECC83, ECC803S, etc.), their 6V equivanents (6DJ6’s, etc) and the lesser gain 12AU7’s. However, Ive never seen much said about the dual-triode 6J6. I’m no audio expert but I’d like to know what you all think about the 6J6 as a preamp tube. They are certainly very cheap nowadays.


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PostPosted: Oct Sun 08, 2006 12:48 am 
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I have not checked the characteristics of the 6J6, but I remember it as tending toward microphonics, which is not a good thing in a preamp tube. Offhand, I would think that 6at6, 6av6, 6c4 or 6ab4 would be 7 pin miniature triodes that are more suited to the job.

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 Post subject:
PostPosted: Oct Sun 08, 2006 2:58 am 
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I do not recall ever seeing the 6J6 used in an audio
application.It was used mostly in RF and computer
applications.As far as audio goes,it could turn out
to be a real performer or a real stinker.You would
just have to experiment with it in some homebrew
audio applications to see if it is any good or not.
Regards,
Swanson


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 Post subject:
PostPosted: Oct Sun 08, 2006 5:35 am 
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Location: Circleville, OH, USA
The 6J6 is a noisy, microphonic tube unsuitable for low level preamp applications.

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PostPosted: Oct Sun 08, 2006 4:02 pm 
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Ken Owens wrote:
The 6J6 is a noisy, microphonic tube unsuitable for low level preamp applications.


Well, guess that answers the question. I always wonder about other types of tubes and why they were not used. For instance, why don't you see an audio amplifier with a 6S4 tube for output? Maybe because it is a triode. Looks from the outside to be a good candidate. I guess since they were not used, there is a reason. But in the instance of Sweep/Output tubes, I can see them being used as a very high power output for an audio amp. I have entertained the thought of building an amp that was designed for 6L6GB outputs but using a 6BG6G instead. I think the characteristics are very similar (except for the plate cap)...

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 Post subject:
PostPosted: Oct Sun 08, 2006 10:02 pm 
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Michael Marx of SND tube sales in St Louis is already selling adapters to use the 6BG6 inplace of 6L6's and others http://www.vacuumtubes.com/6BG6.html

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PostPosted: Oct Mon 09, 2006 12:07 am 
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Don Cavey wrote:
why don't you see an audio amplifier with a 6S4 tube for output? Maybe because it is a triode. Looks frm the outside to be a good candidate. I guess since they were not used, there is a reason.


Here is a 6S4 Amp. There are others.

http://www.the-planet.org/6S4.html

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PostPosted: Oct Mon 09, 2006 12:45 am 
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Very cool Brian! Thanks. I am not sure I will jump on this project but it looks very promising...

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