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Originally Posted by Cerberos
The dropper has failed at the bottom end where C24 is attached. This is why I think the HT smoothing C has gone.
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You are very possibly right. The metal rectifier may also be in a poor state, but this is easy to replace with a diode and some extra resistance.
Have a look at eBay. You often find assortments of power resistors there at very good prices, and you can always combine several resistors to get the correct value. It's worth stocking up on power resistors in the 47R-1K range if you're planning to work on old radios in the future.
If you post your requirements in the 'Parts Wanted' section, a forum member with a good resistor stock may be able to supply you for a couple of quid. Most of us will have suitable diodes for the rectifier too.
Best regards, Paul