via this auction
"Johnson Intonation TrainerMade by the E.F. Johnson Co.
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)"
I know someone who has one of these, I spent about an hour with it once. If your music involves alternative tuning systems you might want to check this out. You use the pots that are laid out like a keyboard to change the tuning of the intervals. So you can listen to beats and tune up pure intervals instead of equal tempered ones. Plus, I think the whole thing is tube-based.
ReplyDeleteCheers, JL
Does anyone know what one of these are worth?
ReplyDelete