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Sequential Circuits Prophet 5 Rev 3.2

Sequential Circuits Prophet 5 Rev 3.2

Brand: Sequential Circuits

Regular price £5,450.00 GBP | Inc.VAT: £6,540.00 GBP
Regular price Sale price £5,450.00 GBP
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Restored to truly superb condition; sought-after Rev 3.2 with extended patch storage (originally a Rev 3.1 that has been converted). Full working order after an extensive, meticulous overhaul by one of the UK’s best synth techs.

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Product Description

It is ready to ship now.

Prophet 5 Rev 3.1, upgraded to 3.2 spec and with patch storage upgrade to the same as a 3.3. For sale meticulously restored, tested and working perfectly.

Covered by our standard 3 month synth warranty.

Engineer's report:

  • Serial number: 2249

  • Unit taken out of storage after a long period of time. Boots and tunes, but makes no sound of any
    kind, apart from A440 tuning signal. Power distribution strip on bottom of PCB 3 partially open
    circuit on -15V path. Replace missing connections with external hook-up wire.

  • Unit now partially works but in a very unstable manner. Electronics separated from chassis work
    and wooden element sent to woodwork shop for refurbishment.

  • Control panel boards removed from unit. Facia cleaned, tantalum capacitors replaced with
    aluminium types and all pots and switches cleaned. Previous attempts to repair track work tidied

  • Whilst instrument in dissembled state work on problems related to the instability. PSU striped of
    all capacitors both electrolytic and tantalum bead types. Replaced with modern aluminium types.
    Replace 2 x 6800uF computer grade capacitors. All three linear regulation devices replaced and
    thermally re-mounted with modern day equivalents. Devices attached to PSU board using fly leads,
    to avoid future lead disconnection whilst moving. Trimmer resistors for +/-15V rails replaced to
    provide more stable setup.

  • On mains input side, frayed mains lead replaced with 3m cable and integral BS1363A mains plug.
    Unsafe and cracked square fuse holder (348 series) replaced with modern day equivalent. DP
    241-8-36 mains transformer replaced due to excessive mechanical noise and hum. Wiring replaced
    and re-terminated as required.

  • CPU PCB 3 also cleared of all tantalum capacitors and replaced with aluminium types. Replace
    burnt 10R 1/2W resistors in +15V HV level shifter circuit. Replace badly repaired multiplexer IC
    with 3 x CD4051BE. Replace depleted 2/3A tabbed battery.

  • In order to stabilise voice board PCB 4 detect and replace certain corroded IC sockets and
    replace. Remove and assemble new 60 way ribbon between PCB 3 & 4, some connection of which
    were going partially open circuit. Replace tantalum capacitors with aluminium types.
    Remove jack earthing wire and replace. Also change audio out jack with highly intermittent
    connection. Clean all others and replace jack nuts and washers.

  • Keyboard cleaned, re-bushed, greased, aligned and cleaned.

  • Reassemble unit with working electronics and test. Recalibrate VCO and VCF tuning. Check and
    calibrate final VCA levels between voices. Remove ‘resonance mod’ on voice 1, replace with
    correct 200K resistor and correct fault masked by modification (partial track disconnection
    around filter).

  • Add new ‘Sequential’ and ‘Prophet-5’ labels to refurbished woodwork. Reload factory patches and
    perform full 1 week soak test.


The face is excellent is excellent cosmetically with only very minor signs of age. The case has been professionally restored and is in superb condition. Currently we only have the one photo you see here but more shots can be sent on request (if you purchase the synth we will send more shots before it ships if needed).

Voltage Information

Switchable voltage for use anywhere in the world - it will be set up ready for you to use before we ship.


For sales in UK/EU the price will include 20% VAT. VAT-free sales are possible to businesses and individuals in the EU (outside the UK) with a valid VAT Number - please get in touch if you wish to buy this way.

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