Hello,
Did that with a 100 Ohms. did not help. However, as you said, it is the probe that start the oscillation when attached to the base of the right transistor, if I put channek B probe on that too, it will stop... also, some times it does not start, when it stops I need to touch the card and then it starts again.
May be I need to rebuild it on a coppar laminated card where I have a good ground there , it is worth a try.
By the way, I tried to drow the schematic of the oscillator from the version I have in my instument (as I mentioned in my first posts, I have a different version), I have a capacitance meter which is good from 1 nf and is not realable. Will post the schemtics later here. It only has one transistor, and Tektronix redesignd it as described in the pictures I posted before. May be I can fix that to work ?
I will try to borrow a capacitance meter which is good from .01pf desolder alll the caps and check them if there is an open cap, I swaped the varicap and the transistor there but no luck, checked all the resistors, all seems to be ok. What I suspect is one of the caps is open.
Will post the picture soon.
George
George