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The Arp 2500

Described as "the embodiment of second generation design and thinking" The 2500 was aimed at "the serious ultra-professional" and had a price tag of around £5400 in 1973, more than the average detached house at the time! There was no fixed configuration, as customers specified the module complement when ordering. Arp made much of its precision and fidelity, no doubt to try and win over Moog customers, used to unstable oscillators. The 2500 however was not entirely without flaw. Several modules (1027, 1045 and 1047) were known to suffer from instability.

The following pages include scans from a number of early ARP/Tonus Inc documents. One is a preliminary "Development Report" from March 1970, the other dated August 10th 1970. The preliminary document includes a tantalising list of "coming soon" modules (Marked as "Proposed module" in the table below), most of which never saw the light of day.

The ARP Method
Click on the module numbers for detailed information (more info to follow...)
Part No Name Notes Price*
1001 Blank panel
5.00
1002 Power control panel
75.00
1003 Dual Envelope Generator
195.00
1003a Dual Envelope Generator Operationally the same as 1003
1004 Voltage Controlled Oscillator
190.00
1004t Voltage Controlled Oscillator (inc. inverted outputs) 245.00
1004r as above (rocker switches) 235.00
1004p as above (proportional mixing) 225.00
1005 ModAmp
295.00
1006 FiltAmp
210.00
1012 Convenience Module Proposed module only???
1013 Octave Fixed Filter Bank Proposed Module
1015 Half Octave Fixed Filter Ban Proposed Module
1016 Dual Noise/Random Voltage Generator
190.00
1019 Oscilloscope Proposed module
1023 Dual Voltage Controlled Oscillator
445.00
1024 Mini Sequencer Proposed 8 step sequencer in single module

1025 Reverberation Module Proposed module
1026 Preset Voltage Module


1027 Sequencer
445.00
1028 Slave Module Proposed expansion for sequencer using removable mini pot boards
1029 Frequency Shifter Proposed module
1031 Dual Multipurpose Filter Proposed module
1032 Mixer.Distributor Proposed module
1033 Dual Delayed Exponential Envelope
215.00
1035 Triple Modulator
??.??
1036 Sample and Hold/Random Voltage
270.00
1037 Dual VC Envelope Generator Proposed module
1038 Dual Preset Envelope Generator Proposed module
1040 Oscillator/Noise Generator
??.??
1042 Triple VCA Proposed module
1045 Voltage Controlled Voice
575.00
1046 Quad Envelope Generator
405.00
1047 Multimode Filter/Resonator
270.00
1050 Mix Sequencer
345.00
2508A Unpowered Cabinet
495.00
2508B New-Combine
495.00
2508C Full upper and lower matrix
595.00
2508D Fully powered Cabinet
770.00
2515A 14 module Cabinet
995.00
2516 2508D +2508A 15 spaces 1265.00
2523 2515A + 2508C 22 spaces 1590.00
2531 2515A + 2508D + 2508A 29 spaces 2260.00
3604B 1 Voice, 4 octave Keyboard 300.00
3001 1 Voice, 5 octave Keyboard 350.0
3002 2 Voice, 5 octave Keyboard 375.00
3212 1 Voice, 2 octave + 2 Voice 3 octave Keyboard 425.00
3222 2 Voice, 2 octave + 2 Voice, 3 octave Keyboard 475.00
5002 PSU
75.00
5100 PSU Kit
150.00