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Old 30th Oct 2019, 3:20 pm   #22
Techman
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Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 4,985
Default Re: Ekco U49 restoration

Trying not to over complicate explanations here, but I guess the OP realises that mains neutral isn't connected directly to chassis, but via the dial lamps and shunt resistor, so all the current drawn by the radio passes through them both. You won't get sensible readings without the lamps in place and working, but you can't fit replacement lamps until the fault has been found and rectified. With blown dial lamps the resistance in series with the set will be higher, and the voltage across the rest of the resistance left in circuit will be higher.

You need to check that both poles of the on/off switch are opening on switch off, but this isn't so important at this stage other than it possibly making the chassis live after switch off, so SAFETY - always pull the mains plug out of the wall socket when making adjustments or touching the chassis frame.
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