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19Seventy7 · 1st Oct 2019, 3:24 pm

I've just taken the back off again and had a look round. The tube is a Mullard A51 570X.
Brightness and contrast work well, and the tube still seems very bright. Probably the brightest I've seen on a tube. I couldn't find anything labelled A1, but I turned down the blue and green guns and got a nice pure red raster. I ended up turning the red gun up so instead of bluey/greeny I got a grey raster.

There has been a resistor added somewhere but im not 100% sure where. Could this have been used to short them as Harry W suggested?

I'm not sure on how to get the voltages from the CRT base.

Sorry if I've missed out something really obvious

Thank you for your help. Greatly appreciated!

1st Oct 2019, 3:24 pm	#22
19Seventy7 Octode Join Date: Jun 2018 Location: Essex, UK. Posts: 1,307	Re: RRI T24E Chassis I've just taken the back off again and had a look round. The tube is a Mullard A51 570X. Brightness and contrast work well, and the tube still seems very bright. Probably the brightest I've seen on a tube. I couldn't find anything labelled A1, but I turned down the blue and green guns and got a nice pure red raster. I ended up turning the red gun up so instead of bluey/greeny I got a grey raster. There has been a resistor added somewhere but im not 100% sure where. Could this have been used to short them as Harry W suggested? I'm not sure on how to get the voltages from the CRT base. Sorry if I've missed out something really obvious Thank you for your help. Greatly appreciated!