Just for the record... this tube was used in a Perkin Elmer Spectrum RX-1 FTIR spectrophotometer. It was excited by a Melles Griot 05-LPM-829-045 DC-DC power block (12VDC, 9.5W(max) input // 1.10-1.50KVDC 4.5mA output). I am betting the power block part number is proprietary also, just as the...