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In Reply to: RE: I think it starts with this posted by Russ57 on August 19, 2014 at 18:58:38
Well thought out. Proven schematic???? LMAO, its a FIRST ever built SE DC 6AH4GT amp, first one EVER to be built to my knowledge.
No problem, I designed it uber conservatively, Golden Ratio tube dissipations, 800 VDC WIMA caps for a 415 VDC circuit, ten times over rated low DCR chokes, under ten Ohms each, and I was able to get the Direct Couple to neatly balance out to 1/4 of a volt from a 400 VDC plus supply.
I'm half a Continent away, this musician dude runs A7 ALTECs in Montreal Canada. I'm having a CLOSE communiucation with the fellow, maybe a local friend there to preview the build, and a variac start up. Also have him reading and re-reading THIS thread. Thanks to all who contributed to this thread, a life-saver !!
Jeff Medwin
Follow Ups:
There are others. Circa 2012, YouTube video.
So I see, I may be the first one to DC the tube in an amp.The YouTube dude says " I was surprised how loud 1 Watt could play. "
Need sensitive speakers !!
Jeff
Edits: 08/22/14
If you are going to suggest something it seems only right that you have first hand positive experience with it. So build the darn thing:) Who knows, maybe it will be prone to oscillations or something sure to cause a first timer grief.
Goes without saying that direct coupled leaves less room for mistakes. Not sure I'd suggest that for a first project.
Workbench safety has little or nothing to do with the integrity of the design. I read a primer on tech safety some years ago, but can't remember where. It included hints like keeping one hand in your pocket when working with live circuits and being careful around a chassis that isn't grounded.
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Buy Chinese. Bury freedom.
It has a lot to do with safety.
1) If I have you build something that I know darn well is going to blow up in your face I think that is a "safety" issuse.
2) If I have you build something that I know isn't going to work right, and make a newbie do a lot of trouble shooting, I think that is a "safety" issuse.
IMHO the best way to insure safety starts with a safely designed item. This is an area I am involved with in the work place. Good work habits go a long ways. Still I see really skilled guys get hurt bad by equipment that is so poorly designed and laid out that "it is an accident waiting to happen". We have seen our fair share of advice given here that would qualify as "stuff waiting to happen".
"...you build something that I know isn't going to work right, and make a newbie do a lot of trouble shooting, I think that is a "safety" issuse."
Sorry, makes no sense to me. The point to all this is to make the newbie an expert at safety. Then it doesn't matter how long he works on it.
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Buy Chinese. Bury freedom.
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