Motorola TS18

[Electronic M]

Originally Posted by Zenith26kc20

I've been working on the TS-18 bakelite on and off for about a year. This set came to me filthy and missing parts. I recapped it and restuffed the electrolytics and replaced the missing parts. The vertical looks full but rolling. The horizontal is too narrow. I would love to hook my frequency counter too the horizontal but don't want to kill it. Same goes for my scope. If anyone has hooked up a scope or counter, please let me know.

Got a 120V isolation transformer to power the TV with? If so that's the recommended solution. Isolation transforms can fail (I found out by feel on an old 50s service transformer a few years ago... Fun!).. Before connecting test equipment measure between the service literature recommended TV chassis ground point and the BNC outter of your scope and or counter with a battery powered DMM... If there's less than 10V AC and DC it should be safe to connect.

Another solution is if you have a spare uninterruptable power supply that can battery back up appliances, plug you scope or counter into the UPS, and unplug the UPS from the rooms wall outlet during measurements. The same DMM check outlined above can be done.

Another thing you can do assuming the RF systems will pass video to screen is find or make a test pattern that'll let you figure out if you're half or double frequency if it'll sync at some multiple. Before I had a scope or counter I did this on a TV that the vertical freq was way off on.