RCA CTC 120, weird tuner issue

[MRX37]

Originally Posted by old_tv_nut

The ringing is probably due to a mistuned IF coil, perhaps a sound trap that's tuned somewhere in the video band instead of at sound frequency. No way of telling for sure what it is without the proper alignment gear.

Given I had to adjust pretty much EVERY tuning slug in the IF section because I had to replace 2 that crumbled...

But, which one would be the cause? L304? The 4.5 trap? Something in the audio section?