Carl, gently shake the toroids and see. Tap the relays with the handle end of a small screwdriver and check.
Coil solder has been known to be occasionally bad. Relays also go bad..
Raj
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At 01-07-18, you wrote:
Daniel is right, I was tapping off the IF for the RTL dongle....
Unfortunately the radio is now only transmitting .5w too! Today I will test the finals although there is no point replacing them until I can find out why my receive is so intermittent. I do hear stations still, they are just much quieter when it cuts out. So maybe this is an audio amp issue and not a sensitivity fault.
Carl.