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Old 16th Jul 2017, 8:41 pm   #8
seanjamesterryb
Triode
 
Join Date: Dec 2015
Location: Portsmouth, Hampshire, UK.
Posts: 18
Default Re: Quad 303 repairs.

paulsherwin, I am not a electronics expert but I have built my own Marshall blues breaker amp clone, and sorted other guitar amps with problems.

Radio Wrangler, I have kept the old transistors. the two new RCA ones are supposed to be old, and the same number as the old ones I took out. I read a lot of posts where bad power transistors cause this amp to overheat. I tried them with a multimeter. I asked here because I thought someone might know what causes the fuse to blow when you replace them.

Thanks julie m, The other night I put one of the old transistors back in, I will put the other old one back in tonight to see if it still blows the fuse. The fuse was not blowing before I took the old two out.

Thanks.
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