Since your 100v amp has a plate over the voltage selector that changes everything. Thats how Stax shipped the 100v amps back in the 80's so they could be converted at a dealer but not by an individual. The simply configured the primaries correctly and then bypassed the need for a plug. There should be the same transformers in both units, if they are the same version (A,B or C in front of the serial number), so there should be a sticker on them with the name "Bando" and then a serial number. If they match then you can hook up the voltage selector as on the 117v unit and then make the same connections internally as the plug would do. That should do it.
I have a T1, mine is modded with most of the wiring replaced with silver and WBT silver RCA jacks, and both the Lambda Pro and the Lambda Signature. The T1 is the work horse of my setup and is turned on 24/7 and it sounds great with most of the Stax models except the tougher loads such as the Omegas, Sigmas and the 4070. It is a clear step up form the SRM-1 Mk2 and it's easy to hear how much better the Lambda Signature is compared to the Pro's.
Happy to help out a fellow Stax nut.
I have a T1, mine is modded with most of the wiring replaced with silver and WBT silver RCA jacks, and both the Lambda Pro and the Lambda Signature. The T1 is the work horse of my setup and is turned on 24/7 and it sounds great with most of the Stax models except the tougher loads such as the Omegas, Sigmas and the 4070. It is a clear step up form the SRM-1 Mk2 and it's easy to hear how much better the Lambda Signature is compared to the Pro's.
Happy to help out a fellow Stax nut.