Quote Originally Posted by Paul Jones View Post
PJ,
I thought I could help you with the part numbers and pulled the board from its edge connector. Some of the transistor cans are too corroded to read all the printed markings. The big SCR is a 2N3669, the four diodes are 1N2860A, the three transistors are 2N3754 (middle right), 2N26?9 (lower left),and unknown in upper middle position.
Paul
Thanks Paul for specs...I thought those diodes might be mil spec. and they were. Also that TO-3 SCR still has an equivalent out there but wonder if they'll last 40+ years¿ Shouldn't be hard to find everything based on these numbers and still have a big box of 1/2 & 1W resistors. Loved the heatsink too by the way! Thanks again for the post! ~PJ