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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 5th Feb 2023, 10:46 pm   #21
DMcMahon
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Default Re: Ferguson 387RG - Loud Humming (constant)

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Originally Posted by PaulR View Post

Looking at other threads about similar sets a solid state selenium rectifier rather than a valve rectifier is mentioned. Those can cause problems including hum. Apparently they give off an awful, unforgettable smell when they fail. I have never experienced this but it is something to think about replacing if yours has one.
The Service manual for the 382U show a UY85 half wave rectifier valve and a Selenium rectifier for the 383A & 385RG.

David

Last edited by DMcMahon; 5th Feb 2023 at 11:07 pm. Reason: Typo error correction, UY84 should have read UY85
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Old 5th Feb 2023, 10:54 pm   #22
DMcMahon
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Default Re: Ferguson 387RG - Loud Humming (constant)

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Unless you are looking at a different service manual/schematic, it is not correct. That capacitor is C46, the "THAT capacitor" is C50 0.01uF coupling the anode output of V4 to the control grid input of V5.

I am looking at The Service manual for the Ferguson 382U, which is shown as the manual for the 387RG in the "Downloads available" link above.


/QUOTE]

David

Additional information is that C50 has a 350VDC rating on parts list
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