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ms660 · 21st Sep 2019, 1:00 pm

Look at the schematic...the -ve of the dual capacitor in the large can is not connected to the chassis, the can should be isolated from the chassis and should connect to the bias resistor etc and mains Neutral via the on/off switch.

The method of obtaining the bias that way was used in live chassis receivers and mains transformer receivers.

Lawrence.

21st Sep 2019, 1:00 pm	#29
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Philips BX281U20 valve radio Look at the schematic...the -ve of the dual capacitor in the large can is not connected to the chassis, the can should be isolated from the chassis and should connect to the bias resistor etc and mains Neutral via the on/off switch. The method of obtaining the bias that way was used in live chassis receivers and mains transformer receivers. Lawrence.