Today's Mystery Guest (RCA CTC-4)

[old_coot88]

The schematic indicates there should be three ferrite slugs inside the CW xfmr. Are all 3 present and intact? No doubt they've been diddled with if somebody's been in there before.

Also, you stated R246 is 22K, where the schematic shows it as 2.2K.
Is the replacement red-red-orange (22K) or red-red-red (2.2K)?
In any case, that would not stop the oscillator from running.

[Phil Nelson]

You're right, it's 2.2K (red-red-red). When I lose the ability to read and type, that's a sign to break for the night

T115 has one adjuster slug accessible from the bottom and a second accessible from the top. The RCA manual says that the bottom adjuster is used in color AFC alignment and the top one for B-Y phasing. Both slugs are present and can be moved (the settings may be completely wrong, of course).

The Sams schematic seems to show that the two secondaries are adjustable, labeling them A64 (top) and A60. No label is given for the primary. I don't know why the primary is shown with an "adjustable" symbol if no adjuster is accessible.

Phil Nelson

[old_coot88]

Could it be a slug is missing from the primary? Or is there a big enuff hole to allow its exit?

(Edit) On second thought, it does look like an untuned primary, since there's no cap in parallel with it.