[Penthode]

Spent a bit of time on the set tonight. It is working well. Issues are fairly minor. Here is a rundown of the good vs bad points.

The Good:
1. Repeated the full IF sweep alignment. This was to ensure each preliminary stage of the IF alignment fell into place so that the final overall sweep alignment only required minor adjustments. Succeeded with only having to make minor tweaks to get the proper response. With the entire RF - IF alignment, chroma bandpass and demodulators complete and successful peaking coil replacements for the luma, I and Q channels, the picture is nice and sharp with no ringing.
2. Convergence very good. Better than I had expected with the electrostatic convergence.

The Bad:
1. Cannot get as good purity as I think it should. Could not get rid of a green contamination in the lower right raster. I removed the chassis to demagnetized as best I could with a degaussing coil to no avail. Was able to conceal it with compromises.
2. AGC problem. Although I fixed the open choke, the AGC still provides "bi-stable" operation. Set starts up okay. However, if you interrupt the signal briefly and reapply, the the AGC voltage drops to zero and the video overloads. By detuning with the fine tuning control and retuning the picture returns. The problem disappears if I remove the AGC delay 4.7Mohm resistor (between AGC line and B plus). Checked all components and wiring. (Recall I had to disassemble the IF chassis to remove the heavy rusting).
3. 15GP22 socket intermittent. The red dropped out this evening. Checked okay the voltages for the red gun at the tube socket. Flexed slightly the socket and the red returned. Suspect it is the Red Screen pin 4 connection which is iffy. I earlier cleaned a rebuilt the CRT socket on the set. The 20 pin plug on the tube it looks like a large chunk of the socket previously broke away and the previous set minder reconstructed it with an epoxy resin. Appears they used a mould for the resin and was well done. However it would be nice to put a good original socket on it. Does anyone know if there are any available?

I hooked up the DVD player and played the prerequisite Wizard of Oz...