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RE: Mastersound 300B (Vaic)

86.106.90.102

In Reply to: RE: Mastersound 300B (Vaic) posted by deafbykhorns on November 10, 2022 at 10:51:54

My thought was that if you know the target is a 500V B+. ("Rail" as he called it.) then by using an available power transformer, outboarding it with clip leads and powering it with a variac , it can be brought up until you get the desired B+ voltage and then you can look at what the power transformer secondary is putting out to get that.

There is a Mastersound dealer online at https://vinylsound.ca that states they do repairs. Maybe you can talk to them to find out what the original power transformer spec is.

Follow Ups:

Just one question, - Ian L 16:45:22 11/10/22 (2)
Just interested to know why the power transformer blew. Are the output transformers OK?
- RE: Just one question, - deafbykhorns 05:37:31 11/11/22 (1)
  OPT's are fine.
  All the fuses installed per spec so no telling what caused the problem.
  I'm guessing heat killed it from all the drippings.
  - RE: Just one question, - Ian L 10:49:42 11/11/22 (0)
    Odd, or interesting. How does a power transformer melt if fuses are correctly sized? Please post when you get it figured out. Something to learn there. Thanks.

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