UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Aga Baltic AH37. Need help identifying old capacitor from 1930s radio

Mike. Watterson · 18th Oct 2018, 10:27 am

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.

18th Oct 2018, 10:27 am	#129
Mike. Watterson Heptode Join Date: Dec 2014 Location: Limerick, Ireland. Posts: 901	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.