[Dekatron]

Good notes!

I always recommend to replace all capacitors with modern Polypropylene capacitors.

Regarding point 1: I have heard of, and also seen myself, that on some CT160 the switch wafer that shorts R14 has been mounted in the wrong position, either the whole switch rotated 180 degrees, flipped over, or the rotating part of the wafer had been rotated 180 degrees compared to the position it should be in, or a combination of these, which also resulted in R14 being shorted in the wrong position and of course opened in the wrong position when the gm-wheel was turned.

This has probably happened after someone has replaced the potentiometer on the gm-wheel and forgotten which way the wafer should be installed in and just put it back as they didn't realise that it was important to put it back in the correct position. I don't think that AVO would have delivered many of these with the wrong position from the factory but you never know. All I have seen myself and seen photos of have had the solder reworked so I haven't seen any which had this fault as new with untouched solder. On some occasions I have suspected that someone has put an incorrect switch wafer there, possibly from some other equipment, probably the original one was broken.

So, always take a lot of photos or make a drawing of how things are placed before you dismantle them.