Hi all,
I lost a channel on my B200S a couple of days ago. Yesterday I popped it open and found that one of the PCB mounted fuses had blown. It was an 8A 32V fuse. I replaced it today and when I fired it up, with both volume pots on zero, it made a loud hum and then another fuse blew.
Bit of history: This unit was originally owned by @rnolan. Back when it was his, something went wrong (richard can fill in these details) and he had a friend rebuild it for him. While he was doing that he filled it full of fuses.
There is one in the wire that goes from the transformer to a thing that is screwed to the chassis. Sorry I can't be more technical than that. It is the second one that blew. It is on the same channel as the original fuse.
Bit more history: In 1997, just before I was about to head overseas for what turned out to be six years, this same unit went dead on me. I left it with a friend and wrote out a big long explanation of what had happened and asked him to take it to a tech to be repaired. Anyway, so when I returned six years later, he gave me back the amp and the two pages of notes I had written for the tech. He had done nothing. I took it to be repaired and the tech replaced the transformer. It has been fine since then. All I have done since then is replace all the jacks and the pots (within the last year or so).
Can anyone give me an idea of where I might start looking for problems. There is a guy nearby that has just set up shop repairing analogue gear so I'll probably take it to him if no one has any suggestions.
Many thanks.
Mike.