Will this circuit work Ok?

el156 · 31st December 2010, 03:55 PM

I would like your coments about tis circuit that i am planing for later on this winter! will it work ok?
Thanks
Silvino

Svein_B · 31st December 2010, 04:53 PM

If you want to use the first double-triode as a diff-amp, you should plan for a cathode CCS, which will need a negative rail of at least some 6-8V, preferably 15-20.

You will need a bypass cap for the The EL156 cathode resistor.

If you do not have a very high output pre-amp, the input sensitivity might not be sufficient, especially if you plan some 6-10dB global feedback.

SveinB.

el156 · 31st December 2010, 05:44 PM

Quote:

Originally Posted by Svein_B

If you want to use the first double-triode as a diff-amp, you should plan for a cathode CCS, which will need a negative rail of at least some 6-8V, preferably 15-20.

You will need a bypass cap for the The EL156 cathode resistor.

If you do not have a very high output pre-amp, the input sensitivity might not be sufficient, especially if you plan some 6-10dB global feedback.

SveinB.

Thanks for your comment! Maybe i should use a ECC83 instead ECC88 to have more gain. And the Bypass cap of course!
Silvino

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31st December 2010, 04:53 PM	#2
Svein_B diyAudio Member Join Date: Oct 2005	If you want to use the first double-triode as a diff-amp, you should plan for a cathode CCS, which will need a negative rail of at least some 6-8V, preferably 15-20. You will need a bypass cap for the The EL156 cathode resistor. If you do not have a very high output pre-amp, the input sensitivity might not be sufficient, especially if you plan some 6-10dB global feedback. SveinB.