gainclone with tube preamp

TomekZ · 31st December 2004, 09:16 AM

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?

Franz G · 31st December 2004, 10:16 AM

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

Joe Rasmussen · 31st December 2004, 10:12 PM

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.

"I wouldn't be so paranoid if everybody didn't hate me." - Frank Burns

31st December 2004, 09:16 AM	#1
TomekZ diyAudio Member Join Date: Jun 2004 Location: Wisconsin	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?

31st December 2004, 10:12 PM	#3
Joe Rasmussen diyAudio Member Join Date: Jan 2003 Location: Sydney, Australia	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. "I wouldn't be so paranoid if everybody didn't hate me." - Frank Burns __________________ The "Elsinore Project" DIY Speaker System Webmaster: Custom Analogue Audio, JLTi and... "The Linear Current Loudspeaker"

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31st December 2004, 10:16 AM	#2
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	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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