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FERNSEH · 12th Jun 2017, 12:40 pm

This morning the open circuit 150 ohm resistor was replaced so now the focus control is working as it should. Even with only 2KV there is a reasonably bright raster. There is a great big ion burn on the screen, this might not be as bad when a full 4KV of EHT is supplied to the CRT anode. Also worth bearing in mind the tube heater is under run, there's actually only 3.3 volts present on the heater connections.

DFWB.

12th Jun 2017, 12:40 pm	#85
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: HMV 1804 Television. This morning the open circuit 150 ohm resistor was replaced so now the focus control is working as it should. Even with only 2KV there is a reasonably bright raster. There is a great big ion burn on the screen, this might not be as bad when a full 4KV of EHT is supplied to the CRT anode. Also worth bearing in mind the tube heater is under run, there's actually only 3.3 volts present on the heater connections. DFWB.