The SECO Model 250 Transistor and Tunnel Diode Tester

This is a quite rare device I picked up on Ebay some years ago, for testing transistors and diodes, including tunnel diodes.

SECO Model 250 Transistor Tester

 SECO 250 Transistor Tester

The instructions are on a label pasted to the inside of the cover, and are unfortunately in a sorry state.

SECO 250 Instructions

Here’s a better image from a recent (2012) Ebay auction for the same type of tester:

Instructions (found elsewhere)
Instructions (found elsewhere)

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