RCA 630TS sound problems, Round 2

[John Folsom]

Phil,
Why not move on to the overall sound if alignment steps, where you are probing after the discriminator. That way, you don't need a demodulator probe. For sound if alignment, you can generally just peak the if transformers for maximum response, there is no stagger tuning to obtain a complex bandpass response as in video IF alignment. This will likely suffice. If not you can always go back to aligning each stage separately using a demodulator probe. You can also do most sound alignment using a DC voltmeter instead of an 'scope (probing after the discriminator), as shown in the RCA alignment procedure. Of course, once you have aligned the sound IF, you may still have to do a video IF alignment to get sound and video to align properly.