Looking for 2246/45 Vertical output chip U701 Part number 155-0322-00 (M429)

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.
 

For parts units I would look at the following models:

2245A
2246
2246A
2252
TAS455
TAS465
TAS475

Before you buy a parts unit, confirm the model has the part...  You can verify using the model's service manual.  My list above could be wrong, but that is what I found.  It might also be worth, if you can, pulling the serial number of the parts unit and checking against serial breaks in the Replacement Parts section of the manual.  You might also want to check with the VintageTek museum...  They may have the part, or a parts unit available.

Hope that helps.

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