• 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.

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Thankx for your reply Tom, that's the problem I ran into, no data so I had to learn to make the measurements. It's as if they didn't build it but I have it. It has a cathode winding and is very similar to a rough sand cast UTC prototype I acquired in 1979 from the widow of a UTC transformer engineer. You can see this Merit OPT on my gallery pics of "Little Red". The mystery remains: what was Merit doing?
 
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