TOM 1501

Introduction

The TOM 1501 is a portable electronic musical instrument (EMI) manufactured by Tula’s factory of musical instruments “Melodiya” between 1985 and 1990. Designed by Gennadiy Terekhov, it’s a versatile instrument suitable for solo performances across various genres and ensemble use.

Key Specifications

• Manufacturer: Tom (Tula’s factory “Melodiya”)
• Production Period: 1985 – 1990
• Type: Analog Preset Synthesizer
• Polyphony: Monophonic (1 voice)
• Keyboard: 61 keys (5 1/12 octaves), non-velocity sensitive, no aftertouch
• Total Audible Range: 6 1/12 octaves
• Engine: VCO (Voltage Controlled Oscillator) Preset

Sound Generation

• Presets: 6 (piano, clave, orchestral ensemble, viola, contrabass, and wind instruments)
• Synthesis: Based on 6 registers on the left side of the keyboard and 5 on the right
• Bass Section: 2 octaves
• Number of Registers: 7
• Filter (VCF): Resonant filter
• Envelope (VCA): ASR (Attack, Sustain, Release)
• Effects: Vibrato, Sustain, Chorus

Instrument Structure

• Main generator (single generator for all tones, preventing detuning)
• 12 manipulators
• Infra-low frequency generator
• Delay line
• Brass filter
• Filter block
• Output amplifier
• Power block
• Volume pedal
• Sustain pedal

Technical Specifications

• Frequency Stability: Max 0.3%
• Pitch Accuracy: 0.035%
• Frequency Modulation of Basic Tone: Max ±3%
• Tone Pitch Retuning: ±6%
• Rated Output Voltage:
  • Mono: 0.3V
  • Stereo: 0.2V
  • Piano: 0.2V
  • Headphone (8 Ohm load): 0.3V
• Background Noise Level: Max 55 dB
• Power Consumption: Max 15W

Connectivity and Power

• Outputs: 5-DIN connections
• Power Supply: 220-230V/50Hz (voltage converter needed for 110/127V)

Physical Characteristics

• Dimensions: 920 x 360 x 195 mm (36.2″ x 14.2″ x 7.7″)
• Weight: Max 13 kg (28.7 lbs) without stand

Unique Features

The TOM 1501 uses a single main generator to form all tones, eliminating the possibility of detuning during operation. It allows for real-time sound changes during performance using special effects like vibrato, sustain, and chorus.

Historical Context

The TOM 1501 represents an interesting example of Soviet-era synthesizer technology. Its preset-based design and monophonic nature were typical of many affordable synthesizers of the 1980s.

Conclusion

The TOM 1501 stands as a unique entry in the world of analog synthesizers, offering a blend of preset sounds and real-time sound shaping capabilities in a portable format. While limited by modern standards, it served as an accessible option for musicians in the Soviet Union during the late 1980s.