[kc8adu]

yes the ctc 17x 18x 19x are decent performers once rebuilt.
the only way i found to fix tob problems properly is to preheat the whole tuner frame with hot air and resolder with a 100w iron and 4%silver solder.never had one come back for tuner/eeprom trouble.if the customer dont use the gemstar i remove it as a preemptive strike.at least the single ribbon type.
unfortunately alot of these sets have been butchered by idiots that think because they own a soldering iron they iz a teeevee expert .
those sets are best used for spare flys and the tubes for high end zeniths that are worth a tube.
and yes you can remove the bonded yoke to put the a68 rca tube in a zenith.looks better than new.