On 2020-10-12 5:34 p.m., Tom Lee wrote:

...
The 465 uses matched pairs in a can for the input source follower +
bias. These were always somewhat rare, and they've only gotten
rarer/more expensive over time. It's good that you have a parts queen.
Hopefully that unit has good FETs, because I have a feeling that you'll
be needing them.

Not sure which type is in the 465, but Linear Systems does sell various
equivalent dual matched JFETs for types used in other Tek instruments
(specifically 603/604 XY's in my case) and they have been great to deal
with.

http://www.linearsystems.com/product.html

--Toby
(not affiliated, just customer)

Good luck!

--Tom