Ctc9f

[Phil Nelson]

Originally Posted by Charlie

I found that the best picture response shows up when I get the channel selector between channels 3 & 4.

I had the same "betweener" symptom on one of my 11s. It may help to tweak the VHF oscillator adjusters. If your CTC-9 is like the CTC-11, you can do this with the TV in the cabinet.

Remove the channel selector knob. If you're lucky, you'll see a circular set of holes in the front of the tuner body. Using a strong flashlight, look inside and you'll see that for the current channel, the adjuster screw is exposed, deep inside. Turning the screw with a l-o-n-g skinny screwdriver should allow you to center the tuning for that channel. Changing to the next channel exposes that channel's adjuster.

Note: I don't know if it's true for this set, but for some TVs you're supposed to adjust the oscillators in a definite order, for example, starting at channel 13 and working down to 2. I adjusted all of my channels in 13-2 order.

Caution: if you unscrew the adjuster way, way too far, it may come out. On one of my sets, one of the adjuster screws was found hanging loose, halfway out of its hole.

The Sams manual should have a procedure for doing this, likely with an oscilloscope. I used a Sencore VA62A that can output a test signal to any channel, adjusting each oscillator "by ear and eye" for best reception on each channel. An agile modulator like the B-T AM60-550B can also output to all channels.

If you're not equipped to do the Full Monte procedure for all channels, it can't hurt to try tweaking the one or two that you use the most. However, if they're low channels and the procedure requires a high-to-low adjustment, perhaps that would be less successful than adjusting all of them, starting with highest.

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html