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lesmw0sec · 28th Oct 2017, 4:32 pm

Just been working on an R1155 that I rescued from the skip a few years back. I had to re-wire it completely as the insulation had turned to mush and I also replaced most of the caps & resistors.

Recently it got very quiet on the highest frequency band and inspection showed that the local oscillator was very weak and stopped working completely on part of the band.

After scratching my head for a while as all the voltages & the bottle were fine, I was not relishing getting at the inductor which is very well buried in these sets.

A bit more poking about revealed a faulty PS capacitor which I had used to replace the padding cap. with. As I probed the leads of it, the osc. output varied.

It just goes to show that one can not assume that the nice relatively new and still shiny components must be blameless!

28th Oct 2017, 4:32 pm	#1
lesmw0sec Octode Join Date: Jul 2009 Location: Carmel, Llannerchymedd, Anglesey, UK. Posts: 1,507	Never assume anything! Just been working on an R1155 that I rescued from the skip a few years back. I had to re-wire it completely as the insulation had turned to mush and I also replaced most of the caps & resistors. Recently it got very quiet on the highest frequency band and inspection showed that the local oscillator was very weak and stopped working completely on part of the band. After scratching my head for a while as all the voltages & the bottle were fine, I was not relishing getting at the inductor which is very well buried in these sets. A bit more poking about revealed a faulty PS capacitor which I had used to replace the padding cap. with. As I probed the leads of it, the osc. output varied. It just goes to show that one can not assume that the nice relatively new and still shiny components must be blameless!