other uses for toroid output autoformers?

Zero Cool · 26th December 2010, 10:37 PM

I have at least 4 if not more autoformers removed from junked PA power amps. 2 are Crown and 2 are QSC and both were 200wpch so these are pretty hefty toroids.

These were used to convert the standard amp output to a high impedance output for driving 70V or 100V distributed line systems. so these have an 8ohm rated input and a 4ohm/70V/100V output typically. I have no idea what they actual specs are but they would be pretty wide bandwidth typically.

should i scrap these or do they have a use??

dave_gerecke · 26th December 2010, 11:54 PM

Hey ZC, if nothing else you can wind your own coils or transformers with them. I would suspect that they have a pretty hefty core.

Peace,

Dave

BudP · 26th December 2010, 11:59 PM

You could make high voltage lateral Fet SE amps with them. Gary Pimm has made some excellent SS amps using higher than normal voltages, Fets and transformers. Don't ask me for more than this, as I know not how to. Nelson Pass may be willing to help though.

Bud

Zen Mod · 27th December 2010, 12:15 AM

only parafeed

look for Nemezis - Hiraga

Speedskater · 27th December 2010, 10:05 PM

From time to time on the various audio forums, people have problems with 70V systems and those transformers are a perfect solution.

PeteMcK · 08:41 PM

used 'backwards', they can be used as valve op transformers, there's an Aussie site that does that, can't find it at the moment

edit: found it:
http://home.alphalink.com.au/~cambie...mp/6an8amp.htm

26th December 2010, 10:37 PM	#1
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	other uses for toroid output autoformers? I have at least 4 if not more autoformers removed from junked PA power amps. 2 are Crown and 2 are QSC and both were 200wpch so these are pretty hefty toroids. These were used to convert the standard amp output to a high impedance output for driving 70V or 100V distributed line systems. so these have an 8ohm rated input and a 4ohm/70V/100V output typically. I have no idea what they actual specs are but they would be pretty wide bandwidth typically. should i scrap these or do they have a use?? __________________ It's not about what you can BUY...It's about what you can BUILD!

26th December 2010, 11:59 PM	#3
BudP diyAudio Member Join Date: Feb 2007 Location: upper left crust, united snakes	You could make high voltage lateral Fet SE amps with them. Gary Pimm has made some excellent SS amps using higher than normal voltages, Fets and transformers. Don't ask me for more than this, as I know not how to. Nelson Pass may be willing to help though. Bud __________________ "You and I and every other thing are a dependent arising, empty of any inherent reality" Tsong Ko Pa

27th December 2010, 12:15 AM	#4
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	only parafeed look for Nemezis - Hiraga __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

27th December 2010, 10:05 PM	#5
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	From time to time on the various audio forums, people have problems with 70V systems and those transformers are a perfect solution. __________________ Kevin

30th December 2010, 08:33 PM	#6
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	used 'backwards', they can be used as valve op transformers, there's an Aussie site that does that, can't find it at the moment edit: found it: http://home.alphalink.com.au/~cambie...mp/6an8amp.htm __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky Last edited by PeteMcK; 30th December 2010 at 08:41 PM.


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26th December 2010, 11:54 PM	#2
dave_gerecke diyAudio Member Join Date: Dec 2007 Location: Vermont	Hey ZC, if nothing else you can wind your own coils or transformers with them. I would suspect that they have a pretty hefty core. Peace, Dave

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