Ok. Let’s try this again…RCA 9TC240 Alignment

[Penthode]

Originally Posted by Chris K

So what tabs on these things am I shunting with the resistors? I haven’t gotten a clear answer for that. I listed the setup and posted the schematic previously but I didn’t get any information. Is it the up arrow side of the coils being called the primaries?

The arrows pointing up mean the trap adjustment is on the top of the chassis. The arrows pointing downmeans the adjustment for the stagger tuned stage is made from under the chassis. Each stagger tuned stage has a resonant coil which connects to T102 terminals A/B and T103 terminals A/D, T104 terminals A/Band and T106 terminals D/C.

The resistors are placed across each stagger tuned coil. There is really no primary and I don't know why you are hung up on that. There is the stagger tuned coil and the parallel tuned trap mutually coupled to it. It is clearly identified on the schematic.

Do you understand what you are doing by clipping in place the resistors? It is to eliminate the resonance of the stagger tuned coils so that the remainder of the video IF strip is just an untuned amplifier. This is so you can see independently the tuner over coupled transformer link frequency response when you sweep it. You must try and understand the process so so will be better able to identify and rectify any problems.