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Old 11th September 2013, 07:10 PM   #11
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> hmm ... I think its the other way round

No. I'm talking 'power' xfmrs used as audio xfmrs,
not 'audio' xfmrs.
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Old 11th September 2013, 07:38 PM   #12
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by hitsware View Post
No. I'm talking 'power' xfmrs used as audio xfmrs,
ahh, got it now, thanks

but then you only want to use the thick secondary, or ?
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Old 11th September 2013, 10:23 PM   #13
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> but then you only want to use the thick secondary, or ?

I was thinking the whole works, but will consider the autoformer angle.
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Old 11th September 2013, 10:28 PM   #14
tinitus is offline tinitus  Europe
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I'm asking because this kind of use is always related to tube amps

and they are about voltage
but if you use solid state its more about current

... or ?
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Old 12th September 2013, 12:34 AM   #15
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> I'm asking because this kind of use is always related to tube amps

That's hi-Z, hi-V converted to lo-Z, lo-V (@~ 8 Ohm)

It can work the other way:
lo-Z (say 8 Ohm)
connect to center tap of 'autoformer'
The full winding will read 32 Ohm ....
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Old 12th September 2013, 12:42 AM   #16
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McIntosh used output autoformers on some of their solid state power amplifiers.
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Old 12th September 2013, 01:18 AM   #17
DUG is offline DUG  Canada
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Quote:
Originally Posted by hitsware View Post
Would you specify a transformer ?
What total power level were you thinking about?

With this information I could suggest a size but have no experience with suitability.
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Old 12th September 2013, 01:54 AM   #18
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~ 10 Watts
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Old 12th September 2013, 02:00 AM   #19
DUG is offline DUG  Canada
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12Vct 1A
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Old 12th September 2013, 01:07 PM   #20
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Quote:
Originally Posted by DUG View Post
12Vct 1A
The center tapped secondary as autoformer works !
8 Ohm up to 32 Ohm.
BUT
Qts went from ~1 to ~0.3
(Wt-3 may misread through the xfmr though?)
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