WT21 Regulator module
This module consists of transistors, resistors, capacitors and diodes. There is a label across two ten pot resistors saying they are bad. Also has printed in white a copyright "SDS-66".
Scientific Data Systems (SDS)
||Printedn white on top of module on component side.
||Printed in white on right side of module on component side.
||Hand written on round red label on component side.
||Hand written on round red label on circuit side.
||Stamped in black at top of module on circuit side.
||Printed in white on top of module on component side.
overall: 1/2 in x 4 1/4 in x 4 3/4 in