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earlytv · 31st Dec 2005, 7:52 pm

Thanks for the help!
CRT I wanted to use was 9 inch round 40 degree deflection angle.
Only CRTs listed were 9AP4 and RCA 1800 series for Ham radio opps
to use. Neither one of those are around anymore. I did find a supply
of almost 9 inch (8.40) 40 degree CRTs that looked like 1800 series.
I have 1st CRT at rebuilder to change screen phosphor, gun and socket.
It will look like a 30s CRT but is way newer than that.
I had them aluminize the screen and that takes a higher anode voltage to work.
TV will use early USA standards of 120, 240, 300 non interlaced lines.
Vert rate = 24. I have a scan converter for all but 300 lines.

31st Dec 2005, 7:52 pm	#5
earlytv Retired Dormant Member Join Date: Apr 2005 Location: Racine Wisconsin USA Posts: 14	Re: HV tube Thanks for the help! CRT I wanted to use was 9 inch round 40 degree deflection angle. Only CRTs listed were 9AP4 and RCA 1800 series for Ham radio opps to use. Neither one of those are around anymore. I did find a supply of almost 9 inch (8.40) 40 degree CRTs that looked like 1800 series. I have 1st CRT at rebuilder to change screen phosphor, gun and socket. It will look like a 30s CRT but is way newer than that. I had them aluminize the screen and that takes a higher anode voltage to work. TV will use early USA standards of 120, 240, 300 non interlaced lines. Vert rate = 24. I have a scan converter for all but 300 lines.