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440V on 450V Caps

Posted by Triode_Kingdom (A) on August 12, 2016 at 16:28:37

In Reply to: RE: Most recent Video on David Beard's homebrew Williamson amp posted by Michael Samra on August 12, 2016 at 09:56:15:

I like what he's doing, it's very clean, but there are a couple areas I'd do differently. One is the safety margin of the B+ caps. He's measuring almost 440V on caps rated 450V. That's much too close. I also see that the hum pot is only accessible from the bottom. Maybe a minor detail, but I prefer things like this to be adjustable from the top or back. The NFB is also a concern. He's applying 20-21dB of feedback, and that strikes me as excessive in a UL amplifier. Makes me wonder if that's the reason for the band-aids on the screens (or perhaps it's the lack of a compensation capacitor in the feedback network). It's easy to get carried away with feedback in the search for lowest measurable distortion, especially when you're staring at a rack full of high-end test gear. Other than those points, it's a terrific looking amp, certainly much better than most one-off efforts.

Edits: 08/12/16

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