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Original Message

RE: Received my new M-60s today.

Posted by jeffreybehr on April 13, 2016 at 17:33:18:
pathologymd:
"Definitely a thing of beauty." Yes, it's certainly neater and more attractive, top and bottom, than my earlier ones were.
"Hmmm. What is the purpose of the bridge with the 2200uF caps behind the fuses?" I have no idea right now; don't have a current schematic. Caps are only 16VDC.
"I don't recall seeing that little circuit board either!" Me too. I think it's some kind of regulator; the devices have 3 pins. One wire is labeled 'cathode'; another is labeled 'coil', but I don't see one of those.
Output-stage caps are Nichicon 2200/200s, 35mm OD; can't see the model designation. Total OS capacitance is (6 X 2200 =) 13200uF. The schematic for a Mk.II.3 shows (6 X 1500 =) 9000uF. My old Mk.3.1 with large-PS option had (12 X 1800 =) 21600uF. I'm fantasizing about substantially improving the quality of those caps. I have 24 BlackGate VK-series 470/160s for (12 X 470 =) 5640uF per amp; probably I'll use something larger in the 1st-two cap. stages of a CRCRC filter. I also have 16 BG VK 150/350s to replace those axial-lead caps in the front-end HV supply.
We'll see.