Interesting hack repair on a CTC-5, your thoughts?

[drh4683]

Today I wanted to go after a problem that I never addressed on my 21-CT-7857, CTC-5 westcott. This is the same TV I posted on youtube last year. I noticed I never was able to cut off the brightness on this set, but the picture was OK so I left it alone. I recapped the entire set with exception of the lytics back in October of 2007. Today I decided it was time to fix it and make it right. I checked voltages in the video output circuit, they looked pretty good, boost voltages on the screen grids at the CRT looked good too. Voltage at the control grids of the CRT were fine so I don't really understand why the CRT isn't cutting off. The CRT tests perfect, so I pulled the chassis to look into this a bit further. Just to rule out CRT defects, I slid the chassis into that CTC-5 I picked up earlier this month as that also has a good CRT. Same problems, so I can rule out CRT issues. I took resistance tests on PW-400 and found a raised value 220 ohm, 1/2watt. It went up in value to about 420 ohms, nothing dramatic but still way off. Everything else looked good until I looked at the contrast circuit. I found this bizarre looking combination of components just hacked in, and soldered around the contrast control. I have no idea what this was all about. My only guess is that it was some tech who tried to fix the problem by sticking different parts in there.
In the pictures, you see a 50uF@50v mallory lytic, a 68 ohm paralled to a 3300pF disk cap and then a 1k from the contrast pot to ground. None of this belongs here according to my schmatics. I'm working out of a 1955-1966 RCA Field Service guide. This particular set has a CTC-5D chassis. I havn't touched a thing yet as far as making it original again per the CTC-5 schematic. Im curious if there are any chassis revisions for the CTC-5 that I'm not aware of? This can't be factory by the sloppy installation, but I want to make sure if I go back to the schematic as shown in my service guide that its indeed the correct wiring with component values for this particular chassis as I know alot of times schmatics don't always reflect what was done at the factory due to chassis improvements. Im curious if anyone else has a CTC-5 chassis can take a look and see if the contrast pot is wired like how I drew it up in the original circuit. I hope that when I put this all back together the right way, my brightness irregularities are solved.