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Old 03-09-2012, 08:52 AM
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Zenith26kc20 Zenith26kc20 is offline
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Join Date: Apr 2009
Location: New Orleans
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High voltage 23 KV, screen voltage 160 volts, cathode current 201 milliamperes. Now the real problem, my Sam's Photofact is very different than the set. Screen resistors in Sam's says a 16k 4 watt with a 120k 2 watt in parallel. Mine has a 56k 2watt in parallel with the 16K. I put resistors in series with the 47 ohm to the screen grid to lower the screen to what Sam's says, and the cathode current dropped to 170 milliamperes. About 1 inch of width missing, poor focus, reduced vertical and a generally dismal picture. I reconnected everything as original and ran the set for 15 minutes. Glorious picture. After 15 minutes, shut it off and touched the flyback. Barely warm! Tried two meters for the current, analog and digital, both the same. Ohmed the screen circuits, all OK. Horizontal drive is -57 volts. The Sam's says CTC9F is in the bunch. Mine is a CTC9F. Anyone have an RCA schematic with these values?
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