Sub Vco (X58-1000-Xx) -00: W, T -11: K, M1, M2 Component Side View; Squelch Switch (X59-1120-00) Component Side View; Fm Mic Amp (X59-1090-00) Component Side View; Cw Break In (X59-1130-00) Component Side View - Kenwood TR-751A Service Manual