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Old 19th August 2008, 02:33 AM   #1
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Default Push Pull Output tranies for SE amp?

Hello all.
I managed to pickup a set of Fisher KX-200 Iron. I have no desire to build a Push Pull amp but would like to build a SE amp.

Would these transformers be a candidate to build a 45 or 71a .7 to 2 Watt SE amp with these? Or should I not waste my time an just wait till I can get some real SE output transformers?

Thanks
Steve
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Old 19th August 2008, 03:06 AM   #2
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Don't waste your time with the Fisher P-P for SE purposes, as they most likely aren't properly gapped to deal with DC. At the power level you mentioned, you can get a nice piece of iron for $20 or so from Edcor. Save the Fisher transformers for when you get interested in a P-P design, or sell them on Ebay to get the bucks for the Edcor transformers. The smaller Hammond 125 series single-ended transformers would also be a good starting point.
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Old 19th August 2008, 05:39 AM   #3
Jeb-D. is offline Jeb-D.  United States
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You can use them as a parallel feed type single ended, but not a conventional single ended.

Quote:
Or should I not waste my time an just wait till I can get some real SE output transformers
Or you could not waste your time with single-ended and use the transformers you have.
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Old 19th August 2008, 07:09 AM   #4
plovati is offline plovati  Italy
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You can always use the Klimo Beltaine solution: one primary winding of the PP active, the other used for DC compensation by means of a current sink (EL34 in the case of Klimo).
Note that in the this case the primary impedance is a quarter of the original anode to anode primary impedance, it is possible to play a little bit with the 4-8 ohm secondary to adjust it.
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Old 19th August 2008, 11:11 AM   #5
fredex is offline fredex  New Zealand
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Default Re: Push Pull Output tranies for SE amp?

Quote:
Originally posted by targeteye
Hello all.
I managed to pickup a set of Fisher KX-200 Iron. I have no desire to build a Push Pull amp but would like to build a SE amp.

Would these transformers be a candidate to build a 45 or 71a .7 to 2 Watt SE amp with these? Or should I not waste my time an just wait till I can get some real SE output transformers?

Thanks
Steve
Although not 'technically' correct don't listen to those who have not tried it. I and others I know have, and it usually works fine. Partridge recommended an air gap for PP transformers as well for technical reasons. If the SE sound rocks your boat you can buy SE tranys later, get that iron heated!
Cheers
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Old 19th August 2008, 01:22 PM   #6
JandG is offline JandG  United States
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Yes, I have a SE amp running old Pilot PP iron & it is way fine, don't know how, but it is, No special circuit. PSE configuraton 6sn7/6sn7
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Old 20th August 2008, 04:16 AM   #7
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Thanks folks. Got the 45's got the trannies, got a bench supply. Guess I'll just hook it all up and give a listen.

Balancing out the dc on the other 1/2 of the Transformer is an interesting idea!

Steve
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Old 20th August 2008, 05:51 AM   #8
fredex is offline fredex  New Zealand
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Quote:
Originally posted by targeteye
..............Balancing out the dc on the other 1/2 of the Transformer is an interesting idea!
Steve
You must do this through a high impedance source. Both halves of the primary are tightly coupled, a low impedance across one half will shunt the signal in the other. If you use the whole primary in series you will get more inductance = bass that goes lower.
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