Beyond SET and ParaFeed.... Complementary Current Triode - Page 7

Tweeker · 9th January 2006, 05:53 PM

How about a low impedance SE transformer followed by an autotransformer?

tubelab.com · 9th January 2006, 05:59 PM

I never paid much attention in those classes where they talked about transformers when I was going to school, I'm an RF engineer. I went to engineering school after I became an engineer! That is why none of my home made transformer experiments worked very well.

I was all set to order a pair of the big Hammonds from Angela Instruments (on their web site for $222 each), and get down to building "the big one" the old fashioned way. I tried calling them every day last week, and they were closed. When I got through today, they said that they had none of these in stock, and weren't going to order any more. Well, back to the drawing board.

I know that my mosfets were blowing up because of "shoot through". This was because of dead time issues, and the fact that my P channel fets that had far less gate capacitance than the N channel fets (H bridge). I was using parts that I had about 4 years ago, which were several years old at the time. This may work much better with some modern fets. I just haven't had time to play with it.

The basic concept of the circuit that I used is on my web site in case any of you get the urge to make some smoke!
http://www.tubelab.com/SSopt.htm

boiss · 24th September 2008, 08:33 AM

Got me thinking about pairing up my GU48 with one of my 813s and my homewound toroid, maybe without very high volts. Watching with a great deal of interest these couple of threads and the results of the 2A3/6V6 combination.
Great stuff!
Mike

smoking-amp · 24th September 2008, 03:11 PM

Since this thread popped up again, I'll just put some references here to later threads on related subjects:

http://www.diyaudio.com/forums/show...107#post1446107

http://www.diyaudio.com/forums/show...781#post1597781

Elias · 24th September 2008, 07:39 PM

Hello,

those links do not seem to work.

- Elias

Quote:

Originally posted by smoking-amp
Since this thread popped up again, I'll just put some references here to later threads on related subjects:

http://www.diyaudio.com/forums/show...107#post1446107

http://www.diyaudio.com/forums/show...781#post1597781

smoking-amp · 24th September 2008, 08:54 PM

"those links do not seem to work."

Hmmm, copy edit didn't work for some reason. Here's another try:

http://www.diyaudio.com/forums/showt...07#post1446107

http://www.diyaudio.com/forums/showt...81#post1597781

smoking-amp · 03:28 PM

Just adding another reference link to the later threads on anti-triode:
Spud, Schade, PP, Anti-triode ECL86

and:
My version of the Simple EL84 or rise of the anti-triode.

smoking-amp · 10th February 2011, 03:32 PM

Arrrgh, that last one should be:
My version of the Simple EL84 or rise of the anti-triode.

9th January 2006, 05:53 PM	#61
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	How about a low impedance SE transformer followed by an autotransformer? __________________ Be sure your foil hat has a good low impedance ground.

9th January 2006, 05:59 PM	#62
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	I never paid much attention in those classes where they talked about transformers when I was going to school, I'm an RF engineer. I went to engineering school after I became an engineer! That is why none of my home made transformer experiments worked very well. I was all set to order a pair of the big Hammonds from Angela Instruments (on their web site for $222 each), and get down to building "the big one" the old fashioned way. I tried calling them every day last week, and they were closed. When I got through today, they said that they had none of these in stock, and weren't going to order any more. Well, back to the drawing board. I know that my mosfets were blowing up because of "shoot through". This was because of dead time issues, and the fact that my P channel fets that had far less gate capacitance than the N channel fets (H bridge). I was using parts that I had about 4 years ago, which were several years old at the time. This may work much better with some modern fets. I just haven't had time to play with it. The basic concept of the circuit that I used is on my web site in case any of you get the urge to make some smoke! http://www.tubelab.com/SSopt.htm __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

24th September 2008, 03:11 PM	#64
smoking-amp diyAudio Member Join Date: Dec 2001 Location: Hickory, NC	Since this thread popped up again, I'll just put some references here to later threads on related subjects: http://www.diyaudio.com/forums/show...107#post1446107 http://www.diyaudio.com/forums/show...781#post1597781 __________________ Ohms Law V = I R

24th September 2008, 08:54 PM	#66
smoking-amp diyAudio Member Join Date: Dec 2001 Location: Hickory, NC	"those links do not seem to work." Hmmm, copy edit didn't work for some reason. Here's another try: http://www.diyaudio.com/forums/showt...07#post1446107 http://www.diyaudio.com/forums/showt...81#post1597781 __________________ Ohms Law V = I R

10th February 2011, 03:01 PM	#67
smoking-amp diyAudio Member Join Date: Dec 2001 Location: Hickory, NC	Just adding another reference link to the later threads on anti-triode: Spud, Schade, PP, Anti-triode ECL86 and: My version of the Simple EL84 or rise of the anti-triode. __________________ Ohms Law V = I R Last edited by smoking-amp; 10th February 2011 at 03:28 PM.

24th September 2008, 08:33 AM	#63
boiss diyAudio Member Join Date: Sep 2006	Got me thinking about pairing up my GU48 with one of my 813s and my homewound toroid, maybe without very high volts. Watching with a great deal of interest these couple of threads and the results of the 2A3/6V6 combination. Great stuff! Mike

10th February 2011, 03:32 PM	#68
smoking-amp diyAudio Member Join Date: Dec 2001 Location: Hickory, NC	Arrrgh, that last one should be: My version of the Simple EL84 or rise of the anti-triode. __________________ Ohms Law V = I R

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