Rens Heijnis                                      custom-built audio equipment




A few examples of  monitor units


Different surround monitor amplifiers, only drawing available 

Passive stereo monitor amplifier  Stereo passive


Surround monitor amplifier.


Stereo monitor amplifier with 2 inputs, 1 output, and switches to control volume.


Surround monitor amplifier with 2 stereo inputs, 1 surround input and surround output.


Stereo monitor amplifier with 2 inputs, 3 outputs, 2 headphones and talkback


Stereo monitor amplifier with 3 inputs and 3 outputs.


Stereo monitor amplifier with 4 inputs, 5 outputs, headphone, and a special mid/side switch.


Stereo Monitor amplifier built with tubes, 2 inputs and remote controlled input and volume.




Stereo monitor unit with talk back, light, tuning fork and gain control of a 6 channels remote controlled pre-amplifier