16 December 2017

A missing trace in the Schlumberger 1240

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Alright. I've gone back and forth the diagram, read the comprehensive manual, looked for possible leaking capacitors both on paper and ...
02 December 2017

New instrument in the lab: Schlumberger 1240 multimeter

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D uring one of my time travels in the 1970's I brought home a Nixie-based multimeter: Schlumberger 1240 . Three and half digits in ...
17 November 2017

Linear PSU failing with overvoltage

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According to timestamps on components, I have owned this linear power supply for 30 years (rms K135). It powered my first CB station (Midlan...
07 November 2017

My first HF RTX, in 2017

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Got home a bit early tonight from work and didn't want to stare at a screen, so I finally dug out my first HF transceiver for a quick ch...
29 October 2017

Failing old LCD displays

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Following my recent interest in old numeric display technologies I came across old calculators, and started collecting them. In early 1970...
24 October 2017

Old instruments with a warm glow

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With the purchase of the Philips PM6645 frequency counter I double the number of instruments sporting Nixies as display device in my lab. ...
19 October 2017

New toy: 500 MHz Philips frequency counter

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At the Mercatino by ARI Biella in October 2017 my Nixie-radar noticed a frequency counter with as many as 9 tubes. It is a Philips PM6645 5...
17 October 2017

Keeping jump wires in order during maintenance

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I think this tip fits the "tribal knowledge" section launched at GQRP reflector and printed in SPRAT magazine. There are some t...