Yeah, I didn't get into Q1218. It did have me running in circles a bit too because of its -8v at the collector.
I did a couple of things: removing it and trying running the scope without it. No effect.
I also measured voltages while switching S1150/Time/Div (to X-Y is cam switch 14). Mostly "correct" and following the engagement/disengagement of S1150/14 (X-Y mode). I say "correct" because the Q1224 base node is connected too, and it throws off the voltages around R1202, R1219, Q1218e.
What I thought was very telling was lifting R1221 resulted in Q1224 base going all the way up to +8v. No hope of the circuit working, but told me there was nothing else pulling that node down. Not Q1214/Q1218 nor the horizontal position pots.
That's when I ran out of ideas and hollered for help.
I've ordered a box of 250 assorted BJTs from Amazon with free delivery for tomorrow. So I'll have some fresh 2N2906s to try. I'll probably (impatiently) swap Q1226/Q1236 into Q1038/Q1098 this afternoon to see if that brings Q1224base back up. Or releases the magic smoke.
Dave
Dave Peterson