[Milsurplus] Early silicon transistor failures

[Ray Fantini]

I spent a lot of time working on GRC-106 sets, one of the highest failure rate items 1A3 frequency standard. The 5 MHz oscillator just stops oscillating, no bad components and just doing regular VOM checks of the transistors and they look good.

They use a couple 2N706 NPN silicon devices, one as an oscillator and the second as a buffer. I tried some generic replacements but no love there. Wonder if I need to buy something for reading gain and start looking at that? The data sheet for the 2N706 tells me that the HEF should be 20

What are you using to see HEF?



Ray F/KA3EKH
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