Test a Transistor with a Multimeter.
Written by Eli, Vetco Electronics
by Thursday, May 04, 2017.

Ask any field or bench technician what their most-used piece of test equipment is and
they will probably say a VOM (VoltOhm Meter) or DMM (Digital MultiMeter).
These versitiale devices can be used to test and diagnose a wide range of circuits and components.
In a pinch, a DMM can even substitute for expensive, specialized test equipment.

One particularly usefull skill is knowing “How to Test a Transistor” using a Digital Multimeter.
Specialized component analyzers exist to do this task, but the expense can be difficult to justify for the average hobbiest.
https://vetco.net/blog/test-a-transi...04-12-25-37-07

For ASTRON DC Power Supplies, you can TEST:

1.) Pass Transistors (2N3055 or 2N3771) on Rear HeatSink.
2.) Diodes and Bridge Rectifier used on the 18 VAC secondary from transformer.
3.) For Continuity and Shorts.