Published on Aug 1, 2018 Sharief Hoffman
via this auction
You can find another video of one previously posted here.
"Very Rare to find Johnson Intonation TrainerMade by the E.F. Johnson Co in 1966
Waseca, Minnesota U.S.A.
* Cool four-voice tunable electronic keyboard (scale selector switch offers choice of standard/tempered tuning or tunable modes)
* Originally used to test the relationship of pitch-matching and pitch-discrimination abilities
Highlights
* Three octave keyboard
* Scale Selector - choose between reference (tempered tuning) or tunable
* Tunable Scale Controls - correspond to notes on keyboard and adjust pitch in tunable mode
* Voicing - choose from four voices - - basic sine wave to reedy / edgy
* Speaker in case (can also connect to external amp, mixer, etc)"
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