• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

hammond transformers?

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To answer the original question:

"i was wondering what are the amps that hammond transformers work in as drop in replacements or upgrades with little or no mods."

I used a pair of Hammond 1650N (60W, 4,300 ohm) transformers to replace the original transformers on a Jolida SJ-502a (KT-88 UL) amp. Even without modification they worked quite well. A little more overshoot on 10kHz square wave but acceptable.
 
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