Name: Justin
Email: nitsuj@localnet.com
Subject: Music Man 212-HD 130
Thread: 64
Time: Thu, 26 Apr 2001 02:56:35 UTC
I am restoring a 212-HD, and replaced the usual parts,power capacitors,screen grid resistors,etc. I have also replaced 5 of the op-amps,the 2 tremolo transistors,some of the bias circuit,and a few misc. capacitors,
and diodes. The amp really sounds great know
but lately there has been a odd harmonic sound,a high frequency scraping glass sound.
It started out only on one note, but know is on many. I took it to the shop,but my repair tech could not pinpoint it. He thinks it may be rust between the laminates of the output transformer, but not sure.I researched as much as I could but could not find any more answers. I've taken good care of the amp, but it's been well used by my father, who purchased it in 1975, and always used it wide-open 6 nights a week.It's been stored properly so I don't think it's rust between the laminates. If you could offer any help I would appriciate it.