A really big Shoo

Originally posted by Kamakiri
I'm pretty sure that the KRK-12 is the CT-100 tuner. The kit may be a retrofit for some VHF only sets to receive UHF, as that tuner should have interchangeable tunable UHF strips.

I have a CT-100 schematic that lists the tuner as a "KRK-12C". It uses one 6BQ7 RF, one 6U8, one 6AF4 Osc, and a germanium diode mixer for all channels including VHF. The 6U8 is used as a 2-stage IF amp after the diode mixer, and there are two IF transformers on the tuner chassis. If memory serves I believe this tuner was also used in a deluxe black & white RCA model of the same period. It is the only turret type tuner I have seen used in an RCA set. All others used the wafer switch style tuners.