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24.27.41.140
In Reply to: RE: Amplifier Bias -Thanks posted by PeterI on June 23, 2021 at 08:21:02
That's similar to the bias circuit I designed for my own amplifier project, currently in process. Use of FW rectification proved advantageous regarding ripple during my simulations. Some people say this isn't overly important, because the push-pull output transformer doesn't respond to common mode energy. However, I've always believed the 60 Hz ripple amplified in-phase by each output tube can indeed become audible as IM distortion on peaks. Like so many other things, this doesn't appear in spec sheets. :)
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Follow Ups:
I see he supplies the EFB from the B+ of the SCA-35. ~350VDC? into a 2w 360Kohm R.
I'm not sure I'd know how to adapt that to my HF-14 clone. He doesn't give voltages to the in and out of the LM337.
The datasheet for the LM337 has the formula for calculating output voltage. His values will probably be very close though. Tweaking the 15K should be enough to put the adjustment pot near the middle.
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