Peter Bagshaw

Thank you this is very helpful. I will check the models you suggested and the museum.

Hi folks. Trying to save a beautiful 2246A scope. 

No vertical drive which I've tracked down to the vertical drive preamp chip U701 Part number 155-0322-00 (M429).

Tried the usual Tek parts places but no luck. I'm hoping someone might have a parts unit with the chip present. I believe the same chip is used in the 2245.

Also considering jerry rigging something maybe a chip from a later series that performed similar function. Or copy a circuit from another scope.

The chip appears to provide final VO gain with trimmer, beam finder, and bandwidth limits. Possibly reproducible in surface mount if anyone can take some measurements for me?

Would be great to have the original part though.

Thanks in advance.