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Old 29th July 2004, 04:37 PM   #1
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Default Zout adapted for 2 EL34 80W Va=560V


It's my second post in this forum...

My problem is that the OT is damged of a Spanish guitar tube amp Sinmarc G-2160-C (80W with Va=560V).

There would want to know which is the output suitable (Zp-p) for 2EL34 in push-pull class AB with 80W of output power and a tension of plate of 560V. I want select a OT...

I have found this web but it does not come specified for 80W and Va=560V.


Which is the ideal Zout?

Suggested 5000 ohms plate to plate...

Thank you very much...
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Old 29th July 2004, 05:36 PM   #2
SY is offline SY  United States
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It will depend on the output stage topology. If we assume pentode, then 5000 ohms is about right.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 29th July 2004, 06:56 PM   #3
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Default Thank you

Thank you for your reply.

The output stage is the Marshall style, but I modified connected supressor grid on the bias voltage and other modification suggested in Tone-lounge.
This modifications are after the OT fried. (injuried)
Sorry for my poor English.

The resistor grid is 5K6 and the resistor bias is 220K.
The Rg2 is 100 Ohms, feed to a 560 ohm from center tap of OT.
The plate voltage is around 560-580V.
If you view the Marshall 2204 JCM800 schematic, it's my base.

I wish that you have an idea of the topology of output stage...

Thank you very much.
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