Can you scope to see if the oscillator is running? That would be the 40V P-P signal. If it isn't there, your problem is with either the oscillator or the service switch - they can be funny that way - ohm out okay, but be leaky enough to kill the oscillator signal to the grid. Make sure it is pushed in all the way, and keep cleaners from it for now - the phenolic absorbs the cleaner and becomes conductive - several megohms, but enough to mess with the oscillator getting to the grid of the output tube.
My guess is the oscillator output isn't getting to the grid of the output tube, and you either have a leaky service switch (it was a "Quick Turnover" [QT] part for RCA) or an open resistor going to the grid from the oscillator.
You did check the grounds/resolder the eyelet grounds on the board already, yes?
Neat seeing my Dad's handwriting on the Sams.
My whole library is like that - dad denoted all repairs on the Sams. He had a full library, and other shops would call to see if he had the Sams. Dad would ask what their problem was, look at the Sams, and if there was any notation, tell the other shop to check that first. If no notation, he'd tell them to come get the Sams - he ran a loaner service to the other shops. Seemed counterproductive to help the competition, but Dad was always swamped with backlog, so he couldn't have taken on any additional repairs...so he leveraged the Sams to get parts, service seminar invites, and the occasional parts chassis.