A working and tested Extron Composite Video and Stereo Audio Distribution Amplifier, part number AVDA 6 MX, The unit is use, but has been tested and is working. The outside has some scratches, open mounting holes, and protruding screws which appear to have been used to mount the unit. All six channels (both video and audio) were tested and observed to be working. I've included the outputs of channel 3 in the photos as an example of the device's operation. 

The test signals were sine waves at appropriate frequencies and were not authentic audio or video signals. The video was tested at 1, 10, 20 and 30 MHz. The audio was tested at 1 kHz. Yellow is input, blue is output.  No other testing was performed.  

The Extron distribution amplifier, shown in the photos, is the only item included in this listing. The photo is taken on a 1 cm grid. I will mail one or two business days after receiving cleared payment. 

Questions are welcome. Thanks for stopping by!