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Heatercathodeshort · 2nd Mar 2015, 4:41 pm

The first picture now lacking the 'soot and whitewash' effect looks a lot better with the limiter [picture spoiler..] completely out of action. The second is giving the classic symptoms of a worn CRT. I agree, I think that is about as far as you can go with this one.
The 3/16 has a 13v heater but early version may have been 8.5v so you have to take care here. A few were 10.5v to add even more confusion. They tend to go O/C without warning and are very bright when operating at the correct voltage.
Well at least you got a picture on the beast! John.

2nd Mar 2015, 4:41 pm	#131
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Marconiphone VRC74DA The first picture now lacking the 'soot and whitewash' effect looks a lot better with the limiter [picture spoiler..] completely out of action. The second is giving the classic symptoms of a worn CRT. I agree, I think that is about as far as you can go with this one. The 3/16 has a 13v heater but early version may have been 8.5v so you have to take care here. A few were 10.5v to add even more confusion. They tend to go O/C without warning and are very bright when operating at the correct voltage. Well at least you got a picture on the beast! John.