Quote:
Originally Posted by Nuvistor
Those white items are probably ok unless you have proved them faulty. There are ’a number of black moulded capacitors, these are likely to be faulty but may not be causing the fault you have.
To determine what’s wrong you need to do some testing, don’t change components unless tested faulty, it usually leads to frustration .
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This is sound advice.
Yes, Hunts 'Moldseal' paper-dielectric capacitors of that age are probably 'leaky', meaning, like a leaky tap washer, they now drip through a little DC current instead of stopping DC altogether and only passing AC. That may not matter much in the circuit of your tuner, and would be most unlikely to stop it working.
Similarly, those attractively colour coded Erie resistors, highly regarded in their day, are likely to have increased their resistance value over the years. Again, that may not matter much, and is most unlikely to cause a major fault. Many resistor values chosen by designers are pretty arbitrary, so that a bit of drift in value with age may still be OK.
If your tuner is silent, I'd be starting with the basics such as: do the valves light up/heat up. Is the HT voltage present?
Best of luck,
Martin