Object is a metal panel bearing five dials and a six-position rotary switch. The dials are, from left to right, Modulation level (calibrated from 80 to 110%); PA Cathode (0-75 milliamperes); a dial calibrated 0-3 milliamperes controlled by the rotary switch (OFF; OSC. CATHODE, 10ma; BUFFER GRID, 0.1ma; BUFFER CATHODE, 10ma; DOUBLER GRID, 0.5ma; DOUBLER CATHODE, 30ma); PA PLATE (0.75 VOLTS); PA GRID (0-30 milliamperes). All wiring has been stripped from the back.
