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  1. H

    Yamaha C4 preamp fault. Hum. Phono switches.

    Have done a lot of work on this preamp and am starting a fresh thread because several faulty components have already been replaced or repaired and am hoping it may now be much easier to isolate and identify the problem. The issue: Hum is present on all inputs. -Playing vinyl on Phono 1 and 2...
    • Hifibythekg
    • Thread
    • earth ground hum hum noise preamp noise preamp yamaha yamaha c-4
    • Replies: 116
    • Forum: Yamaha
  2. H

    Ground hum, Yamaha C4

    Have nearly tracked down the source of a constant loud hum. Think it’s the Phono MC input.. So, am wondering what should I especially check in the area of the Phono MC RCA inputs and pcb? Some background: Inserting a shorting plug into the MC Phono inputs has a modest effect on the volume...
    • Hifibythekg
    • Thread
    • earth ground hum ground issue yamaha yamaha c-4
    • Replies: 36
    • Forum: Yamaha
  3. oztayls

    Thorens TD160S MkV - Speakers are picking up radio signals!

    Hi all, I'm looking for some advice from Thorens owners. I've just bought a nice TD160S MkV on eBay and fortunately it has arrived in one piece. I've not owned a Thorens before. It has a Grace 707 tonearm and the RCA leads are also Grace. After having spent a few hours putting some things...
    • oztayls
    • Thread
    • 160s bad rca earth ground connection hum td160s thorens thorens td160s mkv
    • Replies: 19
    • Forum: Turntables
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