03-31-2014, 09:50 PM
Take a bright LED about 10mA or so. Take a resistor. Take a diode, some 50V Vr will do. Put them in series acrodd any of the 12V filament of one of the tubes.
The diode and the LED should be plugged with the same poalrity and the resistor should be about 1K to 2K.
Try it see how it works.
PS. Do not extract the tube whose filament you used for the LED while the radio is hot.
The diode and the LED should be plugged with the same poalrity and the resistor should be about 1K to 2K.
Try it see how it works.
PS. Do not extract the tube whose filament you used for the LED while the radio is hot.
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