"**The 465B is a great old 'scope, BUT, like many Tektronix 'scopes of the time, tunnel diodes are used in the sweep systems. The tunnel diodes used are VERY hard to source. "

True, and tunnel diode triggering was the best. The thing would almost sync to white noise. My old 422 was that way. And played guitars and organs n **** into it and it always synced up, no problem. Even the human voice. Even most integrated program material (songs already recorded for those who do not know the phrase).

So, when I find something looks right for Q4565 I'll let you all know if it worked.