The CRT might still be a bit de-activated from sitting. With use, they sometimes "wake up" a bit. Or, the CRT may be getting a little soft and needs time to warm up. I have one like that but the picture is great after about 5 minutes. The tube also tests good, but not as good as some of my other ones. Did you try the 8v heater method to wake it up?
Hey Nick, didn't mean to repeat what you said, we were posting at the same time 
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20
Pioneer SX-939, ER-420, SM-B201
Motorola SK77W-2Z tube console
McIntosh MC2205, C26
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