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Parallel Single Ended Amplifier Design using Acro TO-290s?
Parallel Single Ended Amplifier Design using Acro TO-290s?
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Old 15th October 2009, 07:56 PM   #1
diamondsouled is offline diamondsouled  Canada
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Default Parallel Single Ended Amplifier Design using Acro TO-290s?

Have come into some NOS Acrosound TO-290 OTs and was wondering if they would be good to use in a parallel single ended amplifier.

Also wondering if there are some schematics around.

Thanks

Lar
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Old 15th October 2009, 08:35 PM   #2
HollowState is offline HollowState  United States
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Sorry Lar, these are push-pull transformers and cannot be used as singel ended. Not directly at least. They cannot stand unbalanced DC current in the primary. You would have to para-feed them through a big capacitor in series with the primary while choke loading the tube's plate. And at 12,000 ohm impedance you'd probably be better off with a single tube.
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Old 15th October 2009, 08:37 PM   #3
diamondsouled is offline diamondsouled  Canada
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Quote:
Originally Posted by HollowState View Post
Sorry Lar, these are push-pull transformers and cannot be used as singel ended. Not directly at least. They cannot stand unbalanced DC current in the primary. You would have to para-feed them through a big capacitor in series with the primary while choke loading the tube's plate. And at 12,000 ohm impedance you'd probably be better off with a single tube.
I guess with a single tube, 807 or KT66, you'd get about 8 watts?

Cheers

Lar
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Old 15th October 2009, 08:42 PM   #4
DougL is offline DougL  United States
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No.

http://www.clarisonus.com/Archives/Trans/Acro55.pdf
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