via this auction
Pics of the inside below.
"This vintage beauty was put together from a kit by an electrical design engineering professor who held a Ph.D. in computer science at Berkeley. It appears to be a nice soldering job and these older units are getting harder to find. Countless hours of work went into this build. I believe it is in the original shipping box from Southwest Technical Products in San Antonio, Texas. I have installed the 2 required 9 volt batteries, but I could not get the unit to function. It powers on, but no sound comes through the test amplifier. Only a pop when it turns on..."
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