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It's Cary indeed.

You are right on the money. CARY!!

I've been thinking about reducing the uF but not sure by how much. These caps are expensive to experiment with. Besides it also depends on the rectifier design - my Cary is full wave center-tapped. Based on 375-0-375 VAC transformer secondary and a B+ of 495 VDC, that's a 6.6% ripple. Reducing the filter capacitance from 600 to 400 uF would increase the ripple to 10%. Good choice or not?

I've seen people reducing the capacitance by 30% in a Cary's 300B amp and claimed a much more musical (relaxed) sound. But that certainly is a personal preference. I like that kind of sound too. Besides, physical dimensions (limited to 50-51 mm cans) is another constraint.

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