Home OTL Asylum

OTL, Output Transformerless Amplifier User Group.

RE: Received my new M-60s today.

"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.

Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."

Edits: 04/13/16

This post is made possible by the generous support of people like you and our sponsors:
  Parts Connexion  

Follow Ups Full Thread
Follow Ups


Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.