Hmmm. I looked inside the can of the new transformer and discovered a resistor (looks like blue-gray-brown, 680 ohms) in parallel with each cap on the secondary coils:
The data sheet also shows these resistors:
Their "typical" circuit is different than the CTC-4, with a 6AN8 quadrature amp between the reference oscillator and the transformer. It looks like the circuit from the RCA CTC-2B; this schematic specifies the resistors as 680 ohms and the caps as 1500 pf:
The labeling of the secondary terminals is a little different and the resistances differ from the original. I measure 1.7 ohms across the primary (B-E) and .3 ohms across each secondary (F-D and A-C). The original measures 6.8 ohms on the primary and .2 ohms on each secondary.
The question is whether this is a good replacement for the CTC-4. I suppose I could just stick it in (noting the labeling differences on the secondaries) and try old_coot88's most recent suggestion . . . .
Phil Nelson