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Old 01-22-2021, 09:47 AM
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compucat compucat is offline
1949 Motorola 9VT1
 
Join Date: Apr 2005
Location: Suffolk, VA
Posts: 970
Definitely looks like a heater to cathode short in the CRT. Such a short causes retrace lines and renders the brightness control ineffective. It happened once on my Motorola 9VT1 on the 8BP4 CRT and I blasted the short with my CRT tester and it was fine afterward.
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