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Old 4th Feb 2023, 11:47 pm   #15
Gabe001
Octode
 
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,646
Default Re: My first single ended stereo amplifier build

Hi terry thanks for the feedback. Somone mentioned the super black box recently too, but i cannot remember the context. The hum/buzz was in the channel closest to the choke only. I cannot remember whether the predominant frequency was 50hz or 100hz.

I've got the el34s running conservatively at about 22w anode dissipation My experiments with the cathode resistor size seem to indicate that it performs better in THD terms if it runs hotter.
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