Re: Philips BX281U20 valve radio
This radio will work via a Variac if the Variac is working.
There's only one way you should have the mains connected....Mains Neutral to chassis via the on/off switch and the bias supply resistor R75....Mains Live to the fuse in the receiver, both via the plug/socket at the receiver.
There's no polarity for AC....Just Live (Line) and Neutral.
The sine wave indicates AC....The straight Line with the dotted line below it indicates DC.
Lawrence.
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