Re: RFI interference on an HMV stereomaster.
Not sure which Stereo Master it is, I have looked at the 2032 circuit.
The interference could be “getting in” by the earth wire which that filter wouldn’t help if that’s the case.
A common mode type using a ferrite toroid may help on the mains lead and easy to try.
Long speaker leads can also be a problem but the circuit I have should be short unless external speakers are used. If they are external use toroids on those.
After saying all this the mains filter in post #1 could help, but the player uses a mains transformer and I would think( probably wrong) that it wouldn’t get through that.
Paul’s view of faulty Powerline adapter could also be correct and no amount of filtering will work.
I would try a toroid in the mains lead before anything else.
Interference problems seem to be a lot of trial and error.
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Frank
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