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FERNSEH · 11th Oct 2019, 8:04 pm

"I'm going to guess David. Could it be something to stabilize the focus?"
Hi John,
You could well be right because there is no indication of a focus stabiliser valve which was usually an EL41 power pentode.
The set does have a CRT protection valve but it's impossible to tell what type of valve was employed.

DFWB.

11th Oct 2019, 8:04 pm	#6
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Nera Projection Television "I'm going to guess David. Could it be something to stabilize the focus?" Hi John, You could well be right because there is no indication of a focus stabiliser valve which was usually an EL41 power pentode. The set does have a CRT protection valve but it's impossible to tell what type of valve was employed. DFWB.