![]() ![]() The DAC also had a bad pin in the socket, the msb.which made for knobs acting like two position switches of course :-). The one I just worked on had two failed 4067 chips on the front panel boards leading to just noise coming in from there. Capable of stacking all 12VCO's for ultra thick leads by cranking the mix knob all the way left before storing the patch as I recall. You'll need new EPROM (see above) if MIDI is onmi always. ![]() Also to smooth things out a bit the pedal input is a direct analog control and a 10V voltage control pedal is a marvelous addition. But it's a wonderful synth for some of the sounds it can do and some of it's special capability like 12vco stack by cranking mix knob all the way left in unison. The sudden drop at the end of envelopes is particularly bothersome to me. The Prophet 5 is smoother also because it has real EG's and the digital stepping in the Envelope control of the 600 is very evident in some instances. The DAC stepping sounds a bit course on some of the controls as typical with resonance cranked up or with the vco coarse tunes of course. ![]() Z80 controlled synth using 6 pairs of Curtiss CEM3340 vco synth with 6 CEM3374 filters. General Info Links: Vintage Synth Explorer and also check out Crow's Article comparing P600 to Prophet 5 Modifications: keypad repair and Firmware upgrade Teensy++ V version has built in buffer and mod can be done to use if needed bypassing LF356 buffer) or DAC700-CSB-I (some later production still used DAC71 though), CEM3340 VCO, CEM3372 VCF, CEM3360 dual VCA Uncommon chips/modules used: Z80 CPU, 8253 timer, DAC71-CSB-I (old production. ![]() Parts Sources: Keys knobs semiconductors misc Scematics/Service Manual: diy page schematics only or Manual Manor Patches or knob settings: VSE or Wine country patch sheet and sound data Technical assistance Sequential Circuits Prophet 600 -1982 Weight = 22 Lbs. ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |