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In Reply to: Re: output transformers posted by Henry Pasternack on December 4, 2006 at 15:17:07:
Well...I built several amps around the A431's, and rolled a few output TX's. The 1650R's always sounded better. It wasn't what I expected, given the competition. IIRC there were 4 or 5 amp circuits, and that many comparable outputs; TO-330, the UL-II's among them.I could build an amp around the 431, and the 1650R incarnation was always better. A 30W EL34 amp was -1 dB at ~50k cps with the Hammond( at power), and with the 431, it was looking poorly long before that running a resistive load on the bench.
I also tried testing with un-compensated loop NFB. In the same circuit I could *ALWAYS* get more NFB before instability set in with the Hammond output. It isn't a really decent test, but as means of comparing, it was acceptable.
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Follow Ups
- Re: output transformers - NoWay 17:19:00 12/04/06 (4)
- Re: output transformers - les winter 18:45:24 12/04/06 (3)
- Re: output transformers - NoWay 03:22:55 12/05/06 (0)
- Re: output transformers - sorenj07 19:34:55 12/04/06 (1)
- Re: output transformers - les winter 08:21:12 12/07/06 (0)
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