Heathkit A-9C Audio Amplifier Tubes; 2 - 6L6 2 - ECC82 1 - 12AX7 1 - 5V4 Outputs: 4 OHMS,8 OHMS,16 OHMS,500 OHMS Mag-Phone LP-78, Xtal Phone, Mic, Tuner, Volume, Treble, Bass, Tuner Input, Mic Input, Xtalphone Input, Mag Phone Input, Speaker Connections