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On 1950s-60s twin valve amps in record players two questions how do you stop the loudish hum and how do you increase the volume. Thanks.

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The hum is because of bad capacitors in the power supply area. Many of these have caps in the large silver cans. Replace them using standard electrolytic caps and the hum should go away. Once that is gone, the volume should return as well.


Posted on Aug 28, 2008


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Two thoughts here.

On a machine of this age, there's a good chance that any electrolytic capacitors are well past their best. It may be worth replacing them all (it's not hard to identify suitable replacements and they're very inexpensive) before one of them goes bang - it being much easier to identify a suitable replacement by reading an intact can than by trying to piece together lumps of shrapnel you've just sponged out the works.

The history of problems coming on half way through a record hints at a component overheating problem. Have a careful look around for components showing signs of distress. At the same time, examine all the soldered connections you can find, as dry joints can sometimes behave differently when warm (look for soldered joints which aren't as shiny as their neighbours, don't very evidently "wet" both the surfaces they're meant to join, or look all balled up rather than the nice concave shape you expect to see)

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