Moog 901 Oscillator Bank (1967–early 1970s)
The Moog 901 is the original voltage-controlled oscillator bank from the 900-series modular systems, first built in 1967. It was never a standalone instrument. The 901 worked as part of a three-module configuration with the 901A (controller) and 901B (oscillator driver), connected by a special wiring harness that set it apart from later modules. The 900-series modules were hand-wired with epoxy-cased discrete components and used a "split" front panel design with two separate circuit boards.
The 901 bank is the sound heard on Switched-On Bach. moogarchives.com describes its tone as "distinctive" and "fat." It was less stable in tuning than what followed. The 901 series was superseded in the early 1970s by the 921 oscillator series, which improved on stability. DB Magazine (December 1975, p.10) confirmed the transition, noting that the 901A and 901B were replaced by the 921A and 921B, and that the 901C and 982 mixer had been discontinued by then.
Documentation on the 901 is thin beyond this. No original price, dimensions, or production-run figures survive in the record. The frequency range conflicts across sources (one cites 0 Hz - 50 kHz, another 0-40 kHz), so that spec is omitted here pending resolution.
Known specs:
- Voltage-controlled oscillator bank (analog)
- Requires companion modules: 901A controller and 901B driver
- First built 1967; replaced by 921 series in the early 1970s
- Hand-wired, epoxy-cased discrete components; split front-panel design
- Requires special wiring harness
- Known issue: tuning drift/instability
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