Another RCA CT-100 discovery B8001599

[Penthode]

It has been a couple of months since I worked on the CT100. Too many diversions made me put this aside for a couple of months. With the onset of winter, I have the chassis back on the bench and have begun the full IF alignment.

The sound IF discriminator alignment was very straightforward. I have just completed the final IF stage sweep alignment and the traps required a minor tweak. The response matches the service data exactly. I am documenting the entire process so there will be more to come on this.

I was proceeding to do the full IF sweep alignment when I made an interesting discovery. The procedure requires applying a -6.0 volts to the IF line and to connect to chassis ground the junction of 2R133 and 2R134. First I see no 2R133 in the v117 (6AN8) plate circuit so assume it was a typo: I see only a 2C133 connected to 2R134.

I am looking forward to examining the chroma and luma channel responses and posting what I see here.