DIY HiFi Forum

Posted by Goneill (A) on April 28, 2008 at 20:57:46

In Reply to: RE: "Both channels the hum is the same so I made the same mistake on both" posted by OzMikeH on April 28, 2008 at 00:58:39

I don't know how the PS boards on the new Ella are arranged - I suppose they both have their own neg.bias supplies so you have a rectifier on each.

I doubt the diodes you've used in the bridge rectifiers will be the problem, as long as the positive output is being sent to the ground point on the PS PCB and the negative output goes to the original output point of the diode. I used a really cheap DB107 bridge first and although it didn't sound wonderful it certainly didn't hum. I suppose you could swap back in the original diodes as a test.

I'd still bet on a grounding issue, but you could also try adjusting the bias on each tube slightly - maybe one of the new pots isn't making a very good contact.

Thanks for the offer of the photos but if I start a Signature section Brian will try selling me a new kit!

• Hum almost gone now - OzMikeH 02:54:58 05/03/08 (3)
  • RE: Hum almost gone now - Goneill 04:10:35 05/03/08 (2)
    • RE: Hum almost gone now - OzMikeH 18:27:24 05/03/08 (1)
      • RE: Hum almost gone now - mccormick 12:36:10 05/07/08 (0)

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