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If the sound is clear, and you replaced the cathode resistor, and that circuit seems ok,
then it's time to check the next circuit. It may seem frustrating because there is no
dead short, and everything mostly works, but somewhere you may have a tube
with bad voltages on it, improper biasing, and using too much current.
It will take time to find it, Most likely with tedious voltage checks.
.
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Yes you can call me "Squirrel boy"
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