MATRIXSYNTH: 1980s Casio PT-7 w/ Original Box

Wednesday, January 06, 2021

1980s Casio PT-7 w/ Original Box

via this auction

"main features:

29 tiny soft touch foil keys on a detachable slim line keyboard with short cable
built-in speaker

8 notes polyphony

separate knobs for main and rhythm volume

tempo knob

6 preset rhythms {waltz, samba, swing, slow rock, pops, rock} selected by a slide switch

8 OBS preset sounds {piano, elec. piano, organ, pipe organ harp, accordion, clarinet, violin} selected by a 4-step slider + switch

main voice CPU "HD44140, 3G 13" (56 pin SMD) with timbres based on multipulse squarewave tones with different digital envelopes, those are differently low pass filtered through capacitors. It makes very warm and pleasant timbres, but envelope release phase is truncated too soon, which makes piano- like tones less natural.

rhythm IC "NEC D8048C 316, 8322X7" (40 pin DIL, same like in Casio MT-40 that outputs trigger pulses for analogue drums).

analogue percussion {base, snare, open cymbal, close cymbal, clave}; cymbals and snare use transistor noise.

jacks for AC adapter & headphone"

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