April 18Apr 18 Finished the right channel today. Feedback as suggested by Justin. Bias servo as suggested by Kevin. Red smoke – Super Symmetrical mode. Green smoke – Zero Feedback mode.
April 23Apr 23 i habe some current mirror amplifier ss/zf version 1.21 here that i like to use for the amp build. may i ask about two points on the underside of the board (orange marked) look liks place for a jumper on the front siede the are between the two 82ohm resistors. are they for jumper and/or what are they used for. thx
May 13May 13 finished my cfa3 this week, thanks kevin gilmore for the desing and the support from the forum members. running on +-30v with moderat bias, changed the gain resistors to 3.2k for lower gain. needed some 3d printed parts so that all fit fine, a cfa3 in a quad 405 chase. no pot this time, i use a dac with volume control or a preamp. after all amps i build i think the best solution for a 1 case build ist mounting the trafos outside in vertical position, absolut no magnetic hum inducted. i also added grain oriented metal band around the trafos inside the trafo cases.
May 20May 20 Nice! So the trafo is in this box not in an outer case. Would be nice a picture from the front too.
May 20May 20 3 hours ago, judo said: Nice! So the trafo is in this box not in an outer case. Would be nice a picture from the front too. The first picture he posted was from the front. Quad 405 cases have the sink on the front 🙂
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