Project to best use these transformers?

rif · 7th April 2004, 05:29 PM

I just aquired 2 toroidal xformers that aren't quite what I expected. So I'm looking for ideas on how to best put them to use.

Specs: dual primaries 115V, sec. 20V 10A and 118V 13A. They're huge!!!!!!! Something like 8" diam, 5" tall, very heavy (30 lbs?).

Obviously a preamp supply is overkill. Maybe an Aleph power amp? Or for something like a power filter/conditioner for several components? My concern is the lack of center tapped secondaries -- could I use them in reverse?

thanks in advance and have fun with the suggestions! Remeber I have 2 of these beasts.

Sch3mat1c · 7th April 2004, 06:00 PM

Hmm, connect the secondaries in series and use it for a *big* power amp. I think Duo can tell you something about that maybe

Tim

rif · 10th April 2004, 06:17 PM

I don't think you can do that -- the secondaries have diff. voltages.

I could wire the 2 primaries in series, and use the 118V sec. as a +-30 supply (before rect. of course).

Sch3mat1c · 11th April 2004, 06:14 AM

No, series concerns current, not voltage. If I had said parallel, there would be a rather significant problem!! In this case, you will be limited to the lower current rating of 10A, not the major winding's 13A, but personally, it's a small winding imposing the limit so if I had those trannies I'd probably mentally rate them at 11 or 12A.

Tim

rif · 11th April 2004, 02:25 PM

OK, thanks for the clarification. I'm somewhat new to this.

Either way though, the 2nd secondary doesn't seem to give much more -- the 1st sec. is already 118V at 13 amps. Wiriing in series would give me 138V, 10amps (by the book, but probably another amp or 2 as you say).

Any specific recommendations for an amp? One of the Alephs or Zens maybe? I don't know of many others besides those.

7th April 2004, 05:29 PM	#1
rif diyAudio Member Join Date: Jan 2003 Location: Southern NJ	Project to best use these transformers? I just aquired 2 toroidal xformers that aren't quite what I expected. So I'm looking for ideas on how to best put them to use. Specs: dual primaries 115V, sec. 20V 10A and 118V 13A. They're huge!!!!!!! Something like 8" diam, 5" tall, very heavy (30 lbs?). Obviously a preamp supply is overkill. Maybe an Aleph power amp? Or for something like a power filter/conditioner for several components? My concern is the lack of center tapped secondaries -- could I use them in reverse? thanks in advance and have fun with the suggestions! Remeber I have 2 of these beasts.

7th April 2004, 06:00 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Hmm, connect the secondaries in series and use it for a big power amp. I think Duo can tell you something about that maybe Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

11th April 2004, 06:14 AM	#4
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	No, series concerns current, not voltage. If I had said parallel, there would be a rather significant problem!! In this case, you will be limited to the lower current rating of 10A, not the major winding's 13A, but personally, it's a small winding imposing the limit so if I had those trannies I'd probably mentally rate them at 11 or 12A. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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10th April 2004, 06:17 PM	#3
rif diyAudio Member Join Date: Jan 2003 Location: Southern NJ	I don't think you can do that -- the secondaries have diff. voltages. I could wire the 2 primaries in series, and use the 118V sec. as a +-30 supply (before rect. of course).

11th April 2004, 02:25 PM	#5
rif diyAudio Member Join Date: Jan 2003 Location: Southern NJ	OK, thanks for the clarification. I'm somewhat new to this. Either way though, the 2nd secondary doesn't seem to give much more -- the 1st sec. is already 118V at 13 amps. Wiriing in series would give me 138V, 10amps (by the book, but probably another amp or 2 as you say). Any specific recommendations for an amp? One of the Alephs or Zens maybe? I don't know of many others besides those.

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