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Old 30th April 2010, 09:27 PM   #1
E.T. is offline E.T.  United States
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Join Date: Sep 2009
Default Output trannies for 6as7

I've been assuming that I'd be using output caps on a planned 6as7 headphone amp. But I read somewhoere that one can use impedance matching trannies. 6as7 plate impedance nom. 280 ohms. My cans are old-style 600 ohm AKG k240's.

The other day I saw that Elrod has 2-1/2 watt 600/600 and 150/600 trannies for about $14. That's as close as I've found so far. Am I on the right track? I want 300/600, que no?

Since avg power level is more like 150 mW, shouldn't freq response be OK even with a small trannie?

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Old 1st May 2010, 02:55 AM   #2
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If the transformers have a provision for B+ then they should work fine. I suspect though that they are line matching transformers, so putting DC on them will cause distortion.
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