Hello All, I have been sorting my photographs to pass the time and I came across two shots of a fault in some HP10811 oscillators. The varicap diode is connected to a bias resistor and the transistor via a joint on a ferule in a teflon bush. This has not been soldered correctly, the solder has not wet all the leads. Perhaps the operator had been told not to “cook” the joint by taking to long, but in at least two units out of the four that I own, the joint was not properly soldered, and in one case the EFC did not work. A couple of seconds with a soldering iron and it works perfectly. The units obviously worked on final test, but silver plated component leads can tarnish over 20 years and go OC. Even with a gold plated ferule. Cheers, Neville Michie
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