Some NOS Zenith color picture tubes on the Bay.
22QP22

http://cgi.ebay.com/NEW-ZENITH-22QP22-CRT-TELEVISION-PICTURE-TUBE-COLOR_W0QQitemZ220244388599QQcategoryZ50598QQcmdZV iewItemQQ_trksidZp4340.m215QQ_trkparmsZalgo%3DSICD D%26its%3DI%252BC%252BS%252BIA%26itu%3DUS-BWR%252BUCI%252BUCC%252BIT%252BUA%26otn%3D12%26ps% 3D33

A63AAX42X Chromacolor

http://cgi.ebay.com/NEW-ZENITH-A63AAX42X-CRT-TELEVISION-PICTURE-TUBE-COLOR_W0QQitemZ220244379680QQcategoryZ50598QQcmdZV iewItemQQ_trksidZp4340.m215QQ_trkparmsZalgo%3DSICD D%26its%3DI%252BC%252BS%252BIA%26itu%3DUS-BWR%252BUCI%252BUCC%252BIT%252BUA%26otn%3D12%26ps% 3D33

The 22" tube is a rare one... Used in a few late 60s table model sets, and also in the RCA 22" consolettes and metal table models with a CTC-31. The other tube is Zenith's biggest blunder ever; the A63AAX42X. Those seem to have left the factory with a built-in short, which is designed to explode a few transistors in the TV. :sigh: . When I'd get one of those 25" sets for repair in the 90s, I'd put an isolation transformer on the CRT immediately, even if the set came in for a broken antenna terminal.

Charles

bought a 23v sylvania crt from this seller.new in box and it was top quality.suddenly,it was 1968 again!

The other tube is Zenith's biggest blunder ever; the A63AAX42X. Those seem to have left the factory with a built-in short, which is designed to explode a few transistors in the TV. :sigh: . When I'd get one of those 25" sets for repair in the 90s, I'd put an isolation transformer on the CRT immediately, even if the set came in for a broken antenna terminal.

Charles

Ah damn... I was half considering grabbing it for my 25" system 3..

Nope, looks like I'll pass on it.

Oh yeah it's probably a Delta gun CRT anyway.

the A63 tube would be inline, but isn't your System 3 an early 80's?
It would take a 25V tri-focus tube.