Original poster: "Richard W. by way of Terry Fritz <teslalist-at-qwest-dot-net>" <potluck-at-xmission-dot-com> Hi List, I have a couple variacs I probably won't be using, both Staco 033-6565, 120/180 at 22 amps. Can I use these, in parallel with a 13v 50amp filament transformer (secondary) in series with each wiper, as a ballast? Thanks Rick W. Salt Lake