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Valve Radio and Audio Repair Handbook by CHAS MILLER

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Chapter 19

Repairing power supply stages

Chas E. Miller

AC-only receivers

If there should be no reading across the mains lead when checked with an ohmmeter, connect the test prods directly across the set side of the on/off switch, as either it or the lead itself may have gone open circuit. The remedies here are obvious. It is rare for the mains transformer to give trouble unless subjected to gross overloading, so investigate all other possibilities before condemning it. It is worth remarking that a keen sense of smell is as good as a testmeter where transformers are concerned – the odour of a burned-out winding is quite unmistakeable.

Check any fuses with the ohmmeter – don’t trust to appearances. In addition, it is not unknown for a fuse holder in ...

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