I'm working on a Fender Bassman 200 that had distorted output. I found some cracked solder joints on Q15 while probing the topside of the board. I also found a shorted Q10, and signs of overheating around Q10 and Q11.
Since Q10 was shorted, I'm intending to replace the MPSW92 with a ZTX757 and the MPSW42 with ZTX657. I didn't find any other shorted transistors, but given that Q10 failed, are there other transistors that I should be replacing as good practice such as replacing drivers even if they test ok when outputs fail? If so, which transistors should I also replace?
Please correct me if I'm wrong, but are the drivers Q14 and Q15, or are they Q12 and Q13, or both sets of pairs?
Thanks!
Since Q10 was shorted, I'm intending to replace the MPSW92 with a ZTX757 and the MPSW42 with ZTX657. I didn't find any other shorted transistors, but given that Q10 failed, are there other transistors that I should be replacing as good practice such as replacing drivers even if they test ok when outputs fail? If so, which transistors should I also replace?
Please correct me if I'm wrong, but are the drivers Q14 and Q15, or are they Q12 and Q13, or both sets of pairs?
Thanks!
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