Psu tubelabse

Green77 · 12th August 2011, 05:57 PM

Hi all!

Since my power transformer only puts out 300 v i used SS diods insteed of tube. I used the buv26e.
My sound have been ok, but it have been a bit dist in the song, but i didn't hear it from the instruments...
Today i put 2 caps 22nF parallel with the diods. 75% of the dist sound disappered

Anyone know how to kill the rest?

Thanks //Daniel

boywonder · 16th August 2011, 04:24 PM

buv26's appear to be power transistors........

What are you using for SS diodes?

You may want to try Fairchild 8A 1200V stealth diodes or similar and bypass them with your 22nf caps.

or some UF4007's with bypass caps for very little $$.

Green77 · 17th August 2011, 08:46 AM

My bad. BYV26e is the diods..

rknize · 17th August 2011, 07:13 PM

It's a bit hard to say what might be going on without some sort of measurements. If one pursues the theory that bypassing the diodes reduced leakage flux from your power transformer, maybe bypassing the heater rectifiers will improve it further? What is the VA rating of your transformer? Does it get very hot? What is your chassis layout like? What is the chassis made out of?

Green77 · 17th August 2011, 08:13 PM

Power transformer is a Hammond 372jX. 243VA and it's not getting hot..
My chassis is made from steel. I can upload some pic's later in the week..
Around 2 weeks from now i can have a scope home and "see" if there is some problems with B+..any idea?

Thanks //Daniel

12th August 2011, 05:57 PM	#1
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	Psu tubelabse Hi all! Since my power transformer only puts out 300 v i used SS diods insteed of tube. I used the buv26e. My sound have been ok, but it have been a bit dist in the song, but i didn't hear it from the instruments... Today i put 2 caps 22nF parallel with the diods. 75% of the dist sound disappered Anyone know how to kill the rest? Thanks //Daniel

17th August 2011, 07:13 PM	#4
rknize All the best stuff comes from Chian diyAudio Member Join Date: Feb 2009 Location: Chicagoland	It's a bit hard to say what might be going on without some sort of measurements. If one pursues the theory that bypassing the diodes reduced leakage flux from your power transformer, maybe bypassing the heater rectifiers will improve it further? What is the VA rating of your transformer? Does it get very hot? What is your chassis layout like? What is the chassis made out of? __________________ Russ http://www.knizefamily.net/russ/cate...ics/tubeaudio/

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16th August 2011, 04:24 PM	#2
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	buv26's appear to be power transistors........ What are you using for SS diodes? You may want to try Fairchild 8A 1200V stealth diodes or similar and bypass them with your 22nf caps. or some UF4007's with bypass caps for very little $$.

17th August 2011, 08:46 AM	#3
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	My bad. BYV26e is the diods..

17th August 2011, 08:13 PM	#5
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	Power transformer is a Hammond 372jX. 243VA and it's not getting hot.. My chassis is made from steel. I can upload some pic's later in the week.. Around 2 weeks from now i can have a scope home and "see" if there is some problems with B+..any idea? Thanks //Daniel