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I posted a couple of schematics in a past thread , but the demeter is similar too , easy to use a CF stage in front of the xfmruse one half for gain [ although that will invert the signal ]biggest trick is finding a pwr xfmr small enough for the casedo it ptpo.k. can't find them so far but search here[ oops seems i emailed them to you pucho when i didn't know how to poststill got them ?
Although the Jensen transformers usually have a "8xxx" number close to the "Made in USA"