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This box has been discontinued the GKC Part#410 Model #655 is the replacement model

GKC Part# 407 Model #650

(repairs will no longer be done on this model)

Monitor Amplifier With Dialer & Microphone

High fidelity all integrated circuitry used by broadcast engineers as IFB amplifier and by sound men in the ENG fields. This amplifier has the features of the Model #600 with the additional capability of communicating and dialing over a telephone line, and has a built in microphone. It comes with belt clip and battery.


  • Balanced input 600 ohms female 3 pin XLR
  • Output 8 ohms, two phone jacks 1/4" (6.3mm) and 1/8" (3.5mm)
  • Built in condenser microphone
  • Key pad
  • Power output 250 mW
  • Powered by 9V battery
  • Dimensions: 4-1/4" H. 2-1/4" W. 1-1/4" D.
  • Incoming call light




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