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stopped by my tube guy, checked all the tubes on a 539 hickok, turned out the HV regulator tube was very weak (and yet looked brand new). I hope that helps resolved the regulation problem.
Today I replaced 3 resistors on that chroma amp tube, while checking the other tubes he thru in the syn/noise/agc tube, two color demodulators, a new audio tube (6z10), a 2 IF tubes (one shorted, the other very weak), and an RF amp tube (again very weak).
I also replaced the focus rectifier stick.
Cleaned the chassis top, inspected the ground stakes (two were cracked) and resolded.
Cleaned all the gunk around all the term strips/tube sockets, cleaned the tube socket pins (small nylon spiral brush and cleaning juice). cleaned all the tube pins (brass brush). Cleaned all the plug in sockets (hue/color, convergence, yoke) cleaned the CRT socket (sprial brush). Wiped off all the sticky goo from the wires (yoke, CRT, speaker).
inspected the bottom for any componets that may have been moved after working on the resistors, and transporting the chassis.
Cleaned up the fly back plate (dust, general nastyness) careful not to work behind it where you cant see the fine wires.
Still need to give the pots a quick shot of cleaner/lube, that is all the pots on the chassis front, and the volume pot.
the Thermistor is busted, every set I have seen has a busted thermistor. I have a CL90 but not sure if the rating is correct. Will do some checking and see.
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