Delete comment from: Ken Shirriff's blog

Zom-B said...

@Richard: They had lots of magnifying devices in that time, like the ones on pages 13 and 54 of this tube propaganda booklet: http://www.rcaselectron.com/TubesAndTransistors.pdf Though they seem to be of the shadow projection (light from below) type not the metallurgical (reflective) type.

Feb 26, 2019, 1:34:38 PM

Posted to Op amp on the Moon: Reverse-engineering a hybrid op amp module