Looking closely over the schematics see below for key changes from the 25MC33 vs my late model 24MC32 which according to the SAMS date came after the 24NC31/Z. To my earlier question it does not appear that the 24MC32 was built as a cheaper tier chassis, but if price was the driver it resulted in equal or better performance. It will be hard compare with 50+ year old electronics but someday I will get them running well side by side.
- Combined the audio detector and audio output into one tube, a 6j10
- Removed the horizontal efficiency circuit - curious if there is value in adding this, while no has complained about burning up horizontal output transformers in these sets this would maybe provide some adjustments for further safety???
- Added blanking gate diodes
- Changed the color killer circuit to include removing the 6kt8 triode and replacing it with a diode, this left the 2nd chroma bandpass amp as just a single element tube, a 6jc6
- Changed vertical output transformer and horizontal output transformer, note these are the same as was used in the 24NC31/Z chassis
- Changed the power transform resulting in lower source voltages, 330v vs 410v, there are lots of resistor value changes so cant immediately say components saw lower voltages
On the topic of rewinding vertical output transformer and/or dipping then in varnish is there anyone that currently offers this service?