One of my favorite New Order (Joy Division) songs. Covered nicely by Radiohead as well.....now by original JD bassist Peter Hook, his son, and Smashing Pumpkin guitarist.
In progress
Amp design by me, power supply designs and circuit board layout by kerry, support by birgir
+/-300 volt power supplies. complementary push pull all bipolar design with cmos style multiplying current mirror.
Looking good. Thermal grease applied evenly on both sides of isolation pad (to transistor and bracket). Tightened with 0.82 Nm. M3 stainless steel mounting hardware used with disc spring washers underneath.
Started with the PSU board, half through, made first test fit into PSU chassis in order to properly adjust and fix the brackets to the board and make sure everything fits perfectly. Up to the transistors for now...
A little bit of playing with some options/config on the bias supply and we got it down to 40mA draw on the batteries Might be able to do a bit better still.
All in draw now is 260mA. We have some ideas on how to maybe bring this down a bit more.
Lou Ottens, Inventor Of The Cassette Tape, Has Died
https://www.rollingstone.com/music/music-news/lou-ottens-inventor-audio-cassette-tape-dead-obit-1139657/
https://www.npr.org/2021/03/10/975598869/lou-ottens-inventor-of-the-cassette-tape-has-died