Roland System 100M Modular Synthesizer

TPH'S 100M

100m4

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JOERGENSEN TUTTIVOX ANTIQUE TUBE ELECTRONIC KEYBOARD

  • 36 mid- size keys (with small wire lever for contact cleaning, each key controls 3 opener switches)
  • suitcase- style portable amplifier + separate trunk for the organ itself (and its collapsible stand?)
  • 18 OBS tab switches, sorted in 3 groups {16′, 8′, 4′} with each 6 switches. I am not sure yet whether the switches simply set the volume of each group in multiple steps, or if they control more complex filters (the latter seems true, although the effect of some switches is very subtle, and some combinations even seem to cancel out each other).
  • dynamic volume control by black bakelite knee lever + preset volume (right black knob)
  • vibrato with depth and frequency control (left white front and back knob)
  • treble control (right white front knob)
  • tuning (left black side knob, about 2 semi-tones)
  • full polyphonic, analogue sound generator with 1 tube per key. There are 12 oscillator modules for the octave tones; each module contains 3 tubes (ECC82) for the 3 keyboard octaves (this means 36 tubes!); each octave has different, quite complex raw waveforms (not squarewave). 1 small transformer per module seems to generate a 4th octave as overtone. Each module has one common tuning trimmer coil for its 3 octave outputs; I am not sure if this functions by frequency dividers or synched oscillators.
  • 2 input jacks for a jack plug pair at left organ side
  • separate amplifier/ power supply cabinet with very heavy mains transformer, a large loudspeaker and 2 big EL12 power output tubes.
  • 7 pin organ connector with 300V DC high voltage at bare jack contacts without any touch protection and high voltage electronics easily touchable through the knee lever hole (yikes!)
  • 5 Ohm and 200 Ohm external speaker outlets with mute switch for internal speaker
  • electronics mostly based on standard tubes (ECC81, ECC82, ECC83, EZ81), those are fortunately still available.
  • power consumption 183W (on type label stands 200W)
  • wacky, short- circuit prone metal construction that looks very handmade and contains many bolts and a lot of brittle, bolted pertinax circuit boards.
  • info taken from http://weltenschule.de/TableHooters/Joergensen_Tuttivox.html

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MOOGERFOOGER LOWPASS FILTER

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Heckmann – Remixed: 1. 808 (Yari Greco Remix)

track art

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SONOR MINIMAMMUT

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