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  • 3 analogue oscillators (tri, saw, pulse)
  • 2 sub oscillators
  • Low pass 24dB transistor ladder filter, & 12dB high pass filter.
  • Contour ADSR, with auto trigger.
  • VCA gate/ envelope mode.
  • LFO (tri, sq, saw, random, pattern) routable to vco, vcf, pwm.
  • Any mix of LFO waveforms.
  • LFO rate can be controlled by contour shape.
  • Unique LFO 'pattern' waveform (can create pseudo arpeggios).
  • Modulation wheel routed to LFO depth.
  • Pitch bend knob (with centre notch).
  • 3 octave keyboard, with portamento.
  • VCO 3 can modulate VCF.
  • Hi freq. LFO rate (ring mod. effects).
  • Germanium transistor output stage.
  • Supreme quality Nichicon 'audio Gold' capacitors.
  • Hand crafted solid oak case.
  • Military-spec. precision electronic components.

The AR-57 Aurora Synthesizer is the current model in the line of hand built analogue synths from Harpur Instruments (the manufacturing arm of Synth Restore). The AR-57 was originally called the AR1, and briefly AR51, though the only difference was a 2-pole filter, as opposed to a 4-pole type, in the new model.

There are facilities for pitch cv, and gate inputs, plus an external cv control for the filter. There's also an audio input, for processing external signals through the synth.

  • Orders for synths generally take about 3 weeks for completion (unless we have ready-built stock).
  • Each AR-57 Aurora synthesizer, is assembled & hand-finished on-site, and is truly Made In England.
  • UK price £995

The AR-57 Aurora analogue synthesizer. Made in England.


Synth Restore is proud to announce their range of boutique FX (plus guitar FX pedals) for use with synths and guitars.

All FX units & pedals are hand-built, limited production run (typically 100) with serial number & box. These products also have official EAN barcodes.

We endeavour to use local companies for metalwork and printing, so these items are truly British made products (for a change!)

The OC8 Fuzz uses vintage carbon-comp resistors & Germanium transistors, and is traditionally hardwired, mounted on a hand-cut & drilled Paxolin circuit board.

Inside the OC8 Fuzz, vintage hardwired components.

OC8 Fuzz/drive available now - (only 15 left of 50)    
JRR-01 Phaser (available NOV 2015)
OCP-1 Optical Compressor (available DEC 2015)
AE-01 Echo soon    
AT-W Auto-Wah soon


secondhand synths for sale

VCO trio board (multi ARP VCO modules)

AVAILABLE NOW (built to order)

A NEW exciting product, exclusive to SynthRestore.

This is a multi VCO PCB incorporating 3 of the most classic ARP VCO's.

The 4027 VCO, was used in the ARP 2600 modular synthesizer.

The module core layouts are the same as the originals, and we have added the extra components required for square/pulse control. (along with sawtooth).

All you will require is some potentiometers and jack sockets, and you're away! Operates on +/- 15 volts, so can easily be incorporated into a modular setup.

We provide full connection details with each board.

This board is more cost-effective, than purchasing 3 seperate vco modules!


ARP tri vco board

This item will be fully built & tested to order

(actual size of board is 10 x 20 cm)

VCO trio board (built & tested)
Minimoog replacement PCB's

Replacement PCB cards for the Minimoog model D synthesizer. These cards are made to the closest spec. using exact components (where possible) and matched transistors (where required).

The PCB track layout and component sizes are almost identical, therefore giving the correct signal path, retaining the same rich fat Moog sound.

Lovingly hand-built and tested in a Model D Minimoog.


Demo 1 Demo 2 Demo 3 Demo 4

Minimoog Board 4 FILTER - VCA (complete, built and tested)
Minimoog Board 2 dual ENV GENERATOR & KEYBOARD CIRCUIT (built & tested)
Minimoog Board 1 OSCILLATOR (complete, built and tested)

secondhand synths for sale


Modern closely matched equivalents. Valuable synthesizer spares for all ARP gear. Also, you could use these modules as the basis for a custom built modular synthesizer. 1st class UK recorded delivery or Signed-For International shipping. PLEASE NOTE: We do not provide schematics.

ARP 4012 VCF module.(ARP 2600)
ARP 4015 Sample & hold module (ARP 2600)
ARP 4019 Voltage controlled amplifier (ARP 2600)
ARP 4020 ADSR generator (ARP 2600)
ARP 4023 VCF module. (MKI whiteface Odyssey)
ARP 4027-1 VCO module.(ARP 2600)
ARP 4075 VCF module. (MKIII orange/black Odyssey) Price list
ARP, MOOG, OBERHEIM replacement keytops


Replacement NEW manufactured keytops for synths that use 'Pratt Read' style keys.

These will fit on most classic American synths like Moog, Oberheim, ARP and Sequential (not Roland, Yamaha or Korg).

List of compatible synths HERE

Loadsasynths from synthrestore!!

Pratt Read. Black key. Pack of 5
Pratt Read. Top C. Single item
Copyright 2016 Adrian Dolente / A Unified Field. Unauthorized copying, reproduction, hiring, lending, public performance and broadcast of demo's and/or music tracks on this website is prohibited.
Copyright Synth Restore / Harpur Instruments. 57 Harpur Street, Bedford, MK40 2SR. England. Please read the Terms & conditions