Is there a 9-pin mini equivalent of 6AU6? - diyAudio
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Old 14th December 2015, 04:20 AM   #1
rongon is offline rongon  United States
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Default Is there a 9-pin mini equivalent of 6AU6?

I have a gutted Dyna ST70 chassis with four 9 pin sockets ready to go. I was thinking of trying an E-Linear, but I'm hoping I can use a 9 pin mini pentode instead of the 6AU6. Is there a Russian pentode in the 9 pin mini package that will be pretty close?

Does anyone know of a different pentode that can be used instead of the 6AU6?

If not, I guess I'll just have to remove the 9 pin sockets and put in 7 pin sockets.

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Can I sub EF86 (or equivalents) in the E-Linear PP amp?

Last edited by rongon; 14th December 2015 at 04:52 AM.
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Old 14th December 2015, 07:00 AM   #2
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The russian equivalent is 6J4P, but it is a 7 pin tube.
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Old 14th December 2015, 09:45 AM   #3
DF96 is online now DF96  England
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EF86 is very different from 6AU6/EF94. There are lots of European RF pentodes on a 9-pin base. Look at EF80, for example.
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Old 14th December 2015, 09:54 AM   #4
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Quote:
Originally Posted by rongon View Post
I have a gutted Dyna ST70 chassis with four 9 pin sockets ready to go. I was thinking of trying an E-Linear, but I'm hoping I can use a 9 pin mini pentode instead of the 6AU6. Is there a Russian pentode in the 9 pin mini package that will be pretty close?

Does anyone know of a different pentode that can be used instead of the 6AU6?

If not, I guess I'll just have to remove the 9 pin sockets and put in 7 pin sockets.

--

Can I sub EF86 (or equivalents) in the E-Linear PP amp?
if you want 9 pins, there is the 5879, 12by7, 6688, etc...
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Old 14th December 2015, 12:40 PM   #5
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Most of the purpose built single pentodes in a 9 pin bottle either have higher transconductance, or higher plate dissipation than their 7 pin brethren.

If you want a close match to the 6AU6 look at using the pentode half of a 9 pin triode - pentode tube like the 6U8.

If I were doing this I would use a higher transconductance single pentode like the common 6EJ7 and tweak the component values accordingly.
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Old 14th December 2015, 01:45 PM   #6
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Quote:
Originally Posted by rongon View Post
Does anyone know of a different pentode that can be used instead of the 6AU6?
Russian 6Ж9П (6J9P) and 6ЖП11P (6J11P) are very linear hi-gm pentodes near equivalent of E180F.

Prices are still quite fair: 6J9P-E: Long life E180F = 6688 Pentode Tube (5,000 hrs) Halo getter. Price for 4
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Old 14th December 2015, 02:12 PM   #7
rongon is offline rongon  United States
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Quote:
Originally Posted by tubelab.com View Post
Most of the purpose built single pentodes in a 9 pin bottle either have higher transconductance, or higher plate dissipation than their 7 pin brethren.

If you want a close match to the 6AU6 look at using the pentode half of a 9 pin triode - pentode tube like the 6U8.

If I were doing this I would use a higher transconductance single pentode like the common 6EJ7 and tweak the component values accordingly.
Quote:
Originally Posted by artosalo
Russian 6Ж9П (6J9P) and 6ЖП11P (6J11P) are very linear hi-gm pentodes near equivalent of E180F.

Prices are still quite fair: 6J9P-E: Long life E180F = 6688 Pentode Tube (5,000 hrs) Halo getter. Price for 4

Yes, good ideas both. I have a bunch of 6J9P I can use for this. I guess I need to hit the books some more and learn how to tweak those values!

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Old 14th December 2015, 10:46 PM   #8
AJT is offline AJT  Philippines
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i used the russian 6J9 as input stage of a mullard 5-20 like implementation of the EL34 amp, this is the amp i made in 2011...

Click the image to open in full size.
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Old 14th December 2015, 11:28 PM   #9
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EF86 (or 6Ж32П) is closer to 6AU6 (6Ж4П) than EF80 or 6Ж9П
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Old 15th December 2015, 12:01 AM   #10
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How about E83F ?
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