UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Ion burn, When did aluminised CRT's start and become the norm?

Heatercathodeshort · 1st Aug 2022, 11:49 am

I have never seen an ion burn on an aluminised tube. Screen burn yes caused by line or frame collapse or no scan at all! generally you needed a minimum of 7kv to get the advantage of an aluminised tube but EMI managed to do it at 5kv with the 3/16 employed in the 1807 that gave a good picture when working..
Yes Brimar marketed the aluminised C12B in 1949 made by Cintel. A very good triode tube that is capable of giving a super bright picture at the recommended 10kv EHT. Used in the PYE V54C and the KB EV30 series. John.

1st Aug 2022, 11:49 am	#8
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Ion burn, When did aluminised CRT's start and become the norm? I have never seen an ion burn on an aluminised tube. Screen burn yes caused by line or frame collapse or no scan at all! generally you needed a minimum of 7kv to get the advantage of an aluminised tube but EMI managed to do it at 5kv with the 3/16 employed in the 1807 that gave a good picture when working.. Yes Brimar marketed the aluminised C12B in 1949 made by Cintel. A very good triode tube that is capable of giving a super bright picture at the recommended 10kv EHT. Used in the PYE V54C and the KB EV30 series. John.