Thread: Rca ctc-5
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  #74  
Old 10-07-2012, 04:31 PM
DaveWM DaveWM is offline
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Join Date: Feb 2009
Location: Orlando FL
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contrast was a bit low, I had a new video out tube already, so a new 1st video amp and now the contrast is very good, can go from little to too much now.

I was trying to set up the purity so tried sliding the yoke back, and killing the green and red grids with 100k resistor to ground, when I powered it up, no HV. Popped a 3/4 fuse. My guess is I must have shorted out the yoke somehow. I monkeyed around with it some more and tried a new fuse, and got it back. I adj the purity and slid the yoke forward, got a nice full red screen. I am not sure what happened on the yoke but I will not mess with it again until after I have moved the CRT and fixed the plastic. I have a spare yoke so will experiment with it on making up the plastic piece. that way I can keep working on the set while getting the spare yoke ready to go. The center convergence is pretty good now, but the dynamic is still way off.

I have not yet tried adjusting the eff coil for lowest current. IIRC the service manual has you checking the voltage drop across the cathode fuse. I think I will just use my fuse adapter and plug that in with the current meter in place of the fuse to dip the cathode current.
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