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GK1-m

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pabiz

  • Jr. Member
  • Posts: 25
GK1-m
« on: 17 Feb 2006, 10:16 pm »
Hi to everyone
I upgraded my GK1-EL to GK1-M with phono option but now I have a lot of hum,I don't understand where I miss because I follow all the instruction step by step.In the GK1-EL I haven't hum and the preamplifier was so quite,now I have a lot of hum.I shilded the transformers but no change,I disconect HT bypas but no change.I haven't connect led switch indicator and mute switch but I think this is no problem.
Anyone have an idea?

Thank you
Paolo
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AKSA

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    • http://www.aksaonline.com
GK1-m
« Reply #1 on: 17 Feb 2006, 10:18 pm »
Hi Paolo,

This is an earthing issue;  I have sent you further instructions by email, no problem, we will fix this and make it VERY quiet!!

Earth loops are always an issue on preamps.  They drive you mad, and every build seems to be a little different.

Cheers,

Hugh
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