... 2 switch the left and right channels of the amplifier module, and need the same gain setting. Gain settings, ... -plated material, full ON regulator device. Amp output gain adjustment, replace the amp module Amp specifically designed for replaceable modules, in particular ... 3.5mm stereo F adapter , User manual.Headphone amp insider impedance10ohmHeadphone Amp part AP measured curves (tube output test) ...