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FERNSEH · 10th Dec 2016, 6:01 pm

Hi Peter,
The original Cossor CRT was replaced sometime in the early noughties, maybe 2001, so I'd guess the picture you took eight years ago would certainly be from the screen of the replacement CRT that is presently fitted in the set.
But before condemning the CRT the heater volts should be checked. The Cossor 65K has a four volt heater whereas the Cathodevisor 15MW1 had a 2.5volt heater which was supplied via an adjustable resistance from a winding on the timebase and receiver sections mains transformer.

DFWB.

10th Dec 2016, 6:01 pm	#6
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: A scary Baird T23. Hi Peter, The original Cossor CRT was replaced sometime in the early noughties, maybe 2001, so I'd guess the picture you took eight years ago would certainly be from the screen of the replacement CRT that is presently fitted in the set. But before condemning the CRT the heater volts should be checked. The Cossor 65K has a four volt heater whereas the Cathodevisor 15MW1 had a 2.5volt heater which was supplied via an adjustable resistance from a winding on the timebase and receiver sections mains transformer. DFWB.