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Old 18th Oct 2018, 10:27 am   #129
Mike. Watterson
Heptode
 
Join Date: Dec 2014
Location: Limerick, Ireland.
Posts: 899
Default Re: Aga Baltic AH37. Need help identifying old capacitor from 1930s radio

Re: Mains transformer:
Power set with no valves fitted. If the transformer gets hot (it can run cold or just get slightly warm) then there is a short. Check all secondary voltages, any missing mean an open circuit. The primary can seem to read infeasibly low, it's much higher impedance at 50Hz.
I've not looked at circuit. A heater / cathode leakage on rectifier can reduce HT if the rectifier doesn't use a separate heater winding.
Reduced HT or a worn out output valve gives lower volume.
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