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FERNSEH · 18th Jul 2016, 1:47 pm

First observations confirm that the line output transformer housing is in good condition. The 20P4 is exhibiting a blue glow on certain parts of the glass bulb, it's the kind of glow that indicates a particularly good vacuum rather than a gassy valve.
No spark present at the anode of the U25. I'll unsolder this valve and see what happens.

A 1954 BBC report about the temporary transmitter at Truleigh Hill:

http://downloads.bbc.co.uk/rd/pubs/reports/1954-01.pdf

DFWB.

18th Jul 2016, 1:47 pm	#6
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Ekco T221. First observations confirm that the line output transformer housing is in good condition. The 20P4 is exhibiting a blue glow on certain parts of the glass bulb, it's the kind of glow that indicates a particularly good vacuum rather than a gassy valve. No spark present at the anode of the U25. I'll unsolder this valve and see what happens. A 1954 BBC report about the temporary transmitter at Truleigh Hill: http://downloads.bbc.co.uk/rd/pubs/reports/1954-01.pdf DFWB.