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Old 12th November 2012, 04:56 AM   #1
pancaQe is offline pancaQe  United States
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Default 6AU6 replacement

Hi,
I'm in a pickle. I'm in the middle of building a 6V6 push pull mono amp with one 12AU7 and two 6AU6. I just realized I don't have any 7BK tube sockets but have some 9A sockets. So I'm trying to find a sharp cut off pentode in a 9 pin socket with the same characteristics as a 6AU6. Any help would be appreciated. Here's the schematic I'm working off.

http://www.freeinfosociety.com/elect...ew.php?id=2394
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Old 12th November 2012, 05:01 AM   #2
kevinkr is offline kevinkr  United States
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Should not be hard to get the required sockets in about the same time frame as any alternative to the 6AU6A which you probably also do not have on hand. Changing to a different type of tube may require some additional tweaking.
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Old 12th November 2012, 05:05 AM   #3
pancaQe is offline pancaQe  United States
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thanks for your quick response kevinkr. I have hundreds of tubes, lots of time and no money to put into this project. So if I can get a couple of possibilities the chances are good I already have the tubes.
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Old 12th November 2012, 05:10 AM   #4
TheGimp is offline TheGimp  United States
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What topology are you using it in?

What plate current?
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Old 12th November 2012, 06:08 AM   #5
pancaQe is offline pancaQe  United States
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B+ is 460v (unloaded)
what do you mean by topography? You'll have to forgive me this only the second tube amp I've built so I'm a little green.
thanks
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Old 12th November 2012, 06:43 AM   #6
TV7 is offline TV7  Australia
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EF86? they're cheap for good NOS and can be found in many leak circuits..... triode all the way for me.
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Old 12th November 2012, 06:52 AM   #7
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The complete analog is 6SJ7, but it has octal socket. In 9 pin bulb most probably 5879 is the closest one.
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Old 12th November 2012, 07:06 AM   #8
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Quote:
Originally Posted by pancaQe View Post
B+ is 460v (unloaded)
what do you mean by topography? You'll have to forgive me this only the second tube amp I've built so I'm a little green.
thanks
Did you copy the power supply from the schematic you posted? That poor little 5Y3.

jeff
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Old 12th November 2012, 07:17 AM   #9
morinix is offline morinix  United States
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Tube Lore says it is based on 6SH7, another octal tube.
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Old 12th November 2012, 07:45 AM   #10
pancaQe is offline pancaQe  United States
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vinylkid 58: Yes I did, I've pretty much copied that schematic exactly. It looked simple and I thought it might be fun to give it a try. What do you think would be a better choice. Actually if there are any improvements that wouldn't be too far off the original, I'd be willing to try it. It's all just an experiment to me. wavebourne, morinix thanks for your suggestions I take a look at them. thanks
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