[Test-Equipment] HP 403A Solid State ACVM

[Receiver]

Hi,

Found an old HP 403A ACVM in a box in my attic.  I'm looking for a manual 
copy or scan.  Looks as if someone was into it a long time ago.  I think the 
manual or scan would greatly increase my chances of getting it working as 
close to original as possible.  This one also used those small mercury 
batteries that are unobtainium now.

Any or all help or leads greatly appreciated!

73, John, W4NET