Hi Mark,
In the instructions are diagrams detailing conversion to 110-120V mains; it's straightforward.
The transformers are wound with grain oriented silicon steel for 100% correct operation in any mains environment. Originally designed for operation at 50Hz (Australia), the transformers easily accommodate 60Hz as well, and half the supply voltage is just a matter of reconnecting the primaries.
Looking at one of the GK1 transformers, primary tags are(left to right) 0, 115, 0, 115, ES. For 220/240V operation, you bridge the first 115 tag with the second 0 tag. For 110-120V operation, you connect the two 0 tags for neutral, and the two 115 tags for active. ES is connected to chassis and thence to mains IEC earth.
Directions for changing the wiring of the digital control supply are written on the side of the rectangular heatsink and are self-explanatory. Again, you'll only need to amend the primary wiring; the secondary output connections are unchanged.
Calgary, huh? Man, that's colder than Canberra!! Brrrrrrrrrrr!!!!!!!!!! At least you'll be lobbing there as summer comes along. You must look up Bill Perkins, of Pearl, a very knowledgeable fellow who cryo treats tubes and makes tube coolers.
Cheers,
Hugh
