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In Reply to: thank you posted by eedork on March 15, 2007 at 18:09:44:
Regardless, many of the simple SEP circuits that I've been looking at (like the two in the original post) just use a resistor from B+ to provide the screen grid voltage, which is usually a few volts less than the plate. I don't quite understand why this approach won't also work? The voltage won't be as solid as it will be using zeners, but it should still work? I need to research this more too . . . .For one, the B+ can sag too, depending on the load conditions, which would cause the screen voltage to vary too.
You could go overboard and implement a separate screen supply ( a la drlowmu) but I suspect that's more than what you want to do for a beginner project.
Do try a regulated screen supply. Use a cheap easy series string of low voltage zeners (and not a high voltage zener) or look up Maida regulators on diyaudio.
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- Re: thank you - zobsky 18:20:58 03/15/07 (0)
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