4 hours ago
All correct shields must be in place, all tubes correct no subs of any kind.
Check any soldered, riveted ground connections, DC measures of ground cannot detect a ground that has hidden corrosion, solder those riveted grounds to the chassis.
An open coil or a coil with resistance higher than the published specification.
A band switch that has been treated with a lubricant may be leaking. Sam lube on tube sockets can cause this. Clean all excess lube off with 91% alcohol, gently blow dry do not power until all alcohol is gone.
Check the AVC circuit for stray leakage and possible incorrect parts in the circuit.
Do, look for stray wire snips and larger solder blobs causing shorts. A misplaced bypass cap can be problematic too...
Look for calibration errors, a mica may be failing or failed. Calibration is often a clue other than mis-alignment.
GL
Chas
Check any soldered, riveted ground connections, DC measures of ground cannot detect a ground that has hidden corrosion, solder those riveted grounds to the chassis.
An open coil or a coil with resistance higher than the published specification.
A band switch that has been treated with a lubricant may be leaking. Sam lube on tube sockets can cause this. Clean all excess lube off with 91% alcohol, gently blow dry do not power until all alcohol is gone.
Check the AVC circuit for stray leakage and possible incorrect parts in the circuit.
Do, look for stray wire snips and larger solder blobs causing shorts. A misplaced bypass cap can be problematic too...
Look for calibration errors, a mica may be failing or failed. Calibration is often a clue other than mis-alignment.
GL
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
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