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Hi Chris,
Most of the info quoted is from the schematic. Oh, Fabio just jumped in... great!
I also try to trace the path on the boards, to understand better... it's tricky in the mult-trafo section. And the boards are double-sided, messes me up at times. Schematic is the best road map... you can also see which caps are polarized/non-polarized, whether pots are lin/log/revlog, etc. For example, C1 is non-polar, so a 1uf film cap would work. Use your favorite variety, since it's in the signal path. A bi-polar electro might work, but could affect/color the sound more.
The input next to 'XLR in' on board, is for unbal in (no trafo). If you don't have a jack on that input, you don't need C1 or R1. And please somebody yell if that's wrong.
The whatopto_bom_rev2 parts list looks current. Probably generated from schem.
For the OEP, pull all parts ending in '1' if you installed them. RL1, RL2, RC1, CC1. Leave RL, RC, and CC in. Then tell us how you like it!
Happy Tom, we're thinking the same about jumpers. Looks like you can get 150ohm primary, 600 ohm primary, etc on the Lundahl (and OEP, now that I look) with different jumpers. With 150ohm + a DOA for U1, this board might have enough gain to be a combo mic pre + comp. Try plugging a mic straight in.
Have fun and let us know how they sound.
Holy double, triple, and quadruple posts! Posters, you can click on a post and edit or delete the doubles.
