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Old 31st December 2004, 08:16 AM   #1
TomekZ is offline TomekZ  United States
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Default gainclone with tube preamp

Presently, I've 3 gainclones made by different people. All work fine with a passive preamp, but only one gainclone is buzz free when used with a tube preamp. I've tried two tube preamps: Audible Illusions3 & Mapletree Ultra4. The maker of the gainclone that does not buzz is not sure exactly why his works with tube preamps, but speculates that he had a bit of buzz when he had a 47k input load rating, but now uses a 100k input. Any ideas about this? or similar experiences with a tube preamp?
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Old 31st December 2004, 09:16 AM   #2
Franz G is offline Franz G  Switzerland
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I think, you can give you the answer yourself:

Just analyze the grounding scheme of this three amps and compare.

I am quite sure, the solution is in the grounding of the not humming amp.

Regards
Franz

/EDIT: You should not ask the producer of the perfect amp, what could be wrong with the other ones
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Old 31st December 2004, 09:12 PM   #3
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Maybe this page/link below might help, I've updated it recently.

members.ozemail.com.au/~lisaras/ps.htm

If you follow the grounding suggestions here exactly, I can almost guarantee that earth induced buzzes will be solved. I say almost only just to cover myself as I cannot actually be there.


Joe R.

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