High pitch Squeal with 2204
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High pitch Squeal with 2204
I have an original 1984 JCM800 4104 combo with the 2204 50w amp. After playing it, for a while, I started to hear some distortion on some chords, then it squealed so loud I had to turn it off. I let it cool down, then set everything to 5, with preamp and MV set to zero. Plugged into high sensitivity, slowly turned preamp to about 2-3, then brought mv up....seemed okay for a while, and then the loud squeal again. I switched out each preamp tube..no change; looked at solder joints - all look okay. Any ideas? I am halfway thinking of buying a PTP board, removing and checking all components and then rebuild the whole thing -using as many of the original pieces as possible...but that is a big deal. Thank you for any troubleshooting suggestions.