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#2
09-25-2009, 08:05 PM
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No focusing stakes? Pin 9 of the PortaColor CRT is the focus pin - it should go to a threesome terminal through a 1 Meg resistor - some were soldered. Focus options were (1) ground, (2) B+(~275-290V, typical) and (3) Boost(~650-700V). IIRC, the boost and B+ points are right by the big white Elmenco .1/1KV ceramic gonna-be-a-bomb capacitor near the HO tube. I've only seen them tied to B+, as it always seemed to be enough to fucus the tube. Watch your HV too - it can be off only 1KV or so before focus is affected.
My portacolor is needing some power supply 'lytics right now - I don't have the time to fix it just yet. Cheers,
__________________
Brian USN RET 22YRS (Avionics/Cal) CET-Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! 
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