Re: Help with alignment of a Sobell 515P
I can create whistles and burps,
These are likely to be due to poor capacitors.
The critical one drives the output valve grid and must be in good condition or severe damage can be done. Measure the cathode voltage and switch off quick if too high.
Look at the DC voltages and if a screen is low, change the bypass capacitor. There will also be feedback on the AGC line if the capacitor is poor.
You can input signals through a short wire as an aerial. Direct connection is only necessary if sensitivity is low.
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