CTC-4 Director 21

[Phil Nelson]

Sounds like you're nearing the finish line!

If you have a signal generator and scope, you can do a bench test of the crystal. In my CTC-4 article, scroll to the section titled, "Bench Testing the 3.58-MHz Crystals":

http://antiqueradio.org/RCACTC-4ColorTelevision.htm

Thanks to dtvmcdonald for that tip.

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

[SwizzyMan]

From what I am gathering, I think the crystal may be bad. I have it setup to be bench tested. I'm not seeing a real big change in amplitude when I get around 3.58. First picture is at 3.58 and second is way down around 1mhz. This is what I believe the change should look like https://antiqueradio.org/art/RCACTC-...lAnimation.gif

[SwizzyMan]

Any thoughts? I believe the crystal is bad, but I'd like some advice before I go out and buy one.