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µTracer 3+ lid drilling

printed sticker drill template on polycarbonate

3mm through holes, 3.5x2mm sunk holes and 10mm through holes for Lorlin CK1029, 18.3mm through hole for 9 pin vacuum tube socket, 25mm through hole for 8 pin vacuum tube socket with 35x2mm sunk hole.

follow the whole build here: µTracer 3+ build

µTracer 3+ build 8

Part 8. grid bias circuit construction

Part 8. grid bias circuit testing and calibration

measuring -12.64 Volt regardless of Calibration slider after making one mistake
I put D21 (HER108) in the spot of D12
during step C9 I found out (because I had 2 more items left instead of 1)

I unsoldered HER108 and put in D21 and then put the correct 1N5934 in D12

follow the whole build here: µTracer 3+ build