Up for your consideration is this vintage Heathkit Model AD-1307 stereo audio metering control.This metering control allows one to switch between multiple speaker sets and display wattage for amps that lack meters. It also includes a unique stereo electrostatic headphone output. Other than powering up the unit (all lights work), we did not test any of the outputs. As with all of my electronic sales, there are no implied warranties or guarantees. Please look at the photos for details.