The 400 Hz Variacs are widely used in Military Applications
This unit may also be known as a VTP 400-M5-1P
Input: 120 V, Single Phase, 400 Hz.
Output: 0-140 VAC, 6.0 A (7.8 max), 1.62 kVa
Style: Open frame, no dial plate.
The mounting plate is 4 1/2 square.
We have 2 GenRad units in stock (1 unit has a knob and 1 does not)."