On Sunday, 12 May 2019 19:29:45 UTC+1, Cursitor Doom wrote:

Whist it's true there are no trim pots involved, the fixed resistor
values will have changed over the last 65 years, which is quite possibly
responsible for the fault. They would need to be hooked out individually
and replaced, but it's not worth it.

One needs replacing. Sounds like a trivial job. Send it to me if you want.


NT