I've been finding a lot of discrepancies between my set and the service info. Sams seems to be for a later version and Riders is the early. Not sure where mine falls. It has some of the later production changes but not all.
Most confusing so far is the AGC. Schematic shows two AGC busses - one for the IF and one for the tuner. Mine is missing the two components circled on the right and the tuner ties into the IF AGC bus.
I investigated further by popping the cover off the tuner and found the components inside connected to that AGC bus slightly different. In particular R129 is 10K rather than 22K.
It also uses a 6AG5 rather than the 6BH6 n the Sarkes Tarzian tuner.
The tube chart notes this change too.
