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In Reply to: Re: Substitute for 1/2 a 12AX7? posted by audiodude on March 10, 2002 at 11:42:03:
Kevin,Thanks for your message. Are there any potential downsides to paralleling 12AX7 triode sections in this circuit? A quick web search revealed that some people think it's a bad idea and can cause increased harmonic distortion.
Thanks,
David
Follow Ups:
The parallel 12AX7 is not bad idea. It results lower noise, and wider frequency range. (Conrad-Johnson use this connection in his top level poweramp.)
Parallel connection sometimes makes oscillation, but this is not typical for 12AX7. If there will be any oscillation, separated gridstopper will solve it.
In my poweramp I use parallel GEC 5814a, as input stage...Sajti
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