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Hoffman Amps Forum image Author Topic: 6GH8A any good?  (Read 131 times)

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Offline Jonas

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6GH8A any good?
« on: February 25, 2026, 08:35:49 am »
I have a small collection of random tubes, one of which the 6GH8A. This is a 9 pin preamp with a pentode and triode section. 

https://frank.pocnet.net/sheets/135/6/6GH8A.pdf

Would this make for a good preamp? A couple ideas would be pentode -> triode cathode follower, pentode -> triode plate, OR triode plate -> pentode...

What are your thoughts?

Offline johnnyreece

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Re: 6GH8A any good?
« Reply #1 on: February 25, 2026, 09:21:07 am »
My notes say it's in several old Univox amps.  Good replacement for a 7199 (with different pinout!), and much cheaper/easier to find. 

Offline astronomicum

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Re: 6GH8A any good?
« Reply #2 on: February 25, 2026, 09:25:31 am »
My notes say it's in several old Univox amps.

I am not aware of any and would be very interested in knowing which ones?

Offline johnnyreece

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Re: 6GH8A any good?
« Reply #3 on: February 25, 2026, 09:40:02 am »
My notes say it's in several old Univox amps.

I am not aware of any and would be very interested in knowing which ones?

Good call!  Looks like my notes were mistaken.  Univox used the similar-but-different 6AN8.  My apologies! 

 


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