UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Refugee · 20th Nov 2020, 1:37 pm

Your AC will be at chopper frequency.
You will need to unplug the chopper unit and check the heater for continuity with a DMM.
Older ones that had a couple of turns on a 50hz mains transformer were easy to check but an open circuit filament is still the most likely fault with heaters on these kind of displays.

20th Nov 2020, 1:37 pm	#21
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,553	Re: Help with a component ? Your AC will be at chopper frequency. You will need to unplug the chopper unit and check the heater for continuity with a DMM. Older ones that had a couple of turns on a 50hz mains transformer were easy to check but an open circuit filament is still the most likely fault with heaters on these kind of displays.