Waterman "Pocket-Scope" S-10-A
1946
The Waterman Pocket-Scope is a small 2-inch CRT oscilloscope designed as a low-cost and portable oscilloscope for radio repairmen. The design is fairly simple with 3 tubes and a 2AP1 CRT. A single 6J6 tube provides horizontal sweep at speeds up to 50KHz.

Schematic: watermans10a.pdf

 
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Jon Stanley