[Heathkit] IM-25 "SS VTVM" Power Supply Mod?

[jack m]

(This query has also been posted on QRZ-Boatanchors Tech Forum.}
 
I am attempting to get my vintage IM-25 solid state ssvm working again.  The unobtanum mercury battery is spent, and I am tired of replacing the 14 C-cells due to cost (which is the main reason I retired it 15 years ago).  I have not been able to locate a new 1.35 v battery so far, even at the camera stores or Batteries Plus (& Bulbs).

 Does anyone know of a power supply circuit or mod for the voltages - especially the 1.35 v ohm circuit - before I start trying to reinvent the wheel?  I do not need the battery or portable capability for this unit.

 Thanks.

 Jack
 W3RU