Nerd shit: small polystyrene caps for the high freqs, yellow polycarbonate phillips caps and notice the giant silver Russian 10 uf film caps! no electrolytics in my filter! Measuring all the caps and re-calculating frequencies Most vintage capacitors have tolerance values of 5%, 10% 20% and i was using tons of vintage stuff from my stash, so i needed measure, especialy for a passive eq. If you don’t measure parts, or limit yourself to using an available brand of expensive -1% parts, the frequencies will vary from the calculated values and the spacing of the freqs can be weird, too far or bunched together. This is an advantage of home made electronics, because of parts tolerance it would be very expensive for a manufacturer to exactly match all units. I matched all the inductors values and cap to less than 1% and got all the frequencies i wanted spot on. It’s a long and tedious process but it’s way easier than it seems once you get the hang of it. Pretty much the same process for all the other eq’s. I had a 24 positions switch for the high band, compared to 5 frequencies on the original, so, alot more math, measuring etc.
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January 2023
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