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Eventide Clockworks Instant Phaser & H910 Harmonizer – Studio Legends from the Golden Age of Analog

A rare opportunity to acquire two of the most iconic studio processors ever made — the Eventide Clockworks Instant Phaser and the Eventide H910 Harmonizer. These groundbreaking units from the 1970s helped define the sound of classic recordings by artists such as Led Zeppelin, David Bowie, Frank Zappa, and AC/DC, and remain highly sought-after by collectors, engineers, and producers worldwide.

Eventide Instant Phaser (Model PS-101, circa 1972–1975)

The world’s first studio phaser, offering lush, organic modulation and deep stereo movement. Unlike guitar pedals of the era, the Instant Phaser was designed for professional recording studios and features true analog circuitry with variable control for depth, rate, and manual sweep, plus remote control and oscillator sync options.

Type: Analog studio phaser

Controls: Manual phase, oscillator rate, depth, mix, remote input

Circuit: Discrete analog all-pass network

Era: Early 1970s, built in New York, USA


Eventide H910 Harmonizer (circa 1975–1978)

The first digital pitch shifter and harmonizer ever produced, the H910 revolutionized studio production with its unique ability to alter pitch and delay in real time. Praised for its warm, slightly gritty tone and unpredictable charm, the H910 became a creative tool for thickening vocals, widening guitars, and adding otherworldly textures.

Type: Digital pitch shifter / harmonizer

Pitch Range: ±1 octave

Delay Time: Up to 112.5 ms

Controls: Coarse/Fine pitch, feedback, delay, mix

Connectivity: XLR balanced I/O

Era: Mid to late 1970s, made in USA


Condition:

Both units are fully function, and maintained to studio standards. Cosmetic condition is excellent for their age, with all original knobs, switches, and front panels intact.

These two units together represent a turning point in audio history — the moment when Eventide brought studio modulation and digital harmonizing into the modern era. Perfect for collectors, studios, or anyone who values true analog and early digital craftsmanship.

Please see detailed photographs for condition of the items they form part of the description as you can see.
Please note that we do not garantee vintage electronic items. These are truely vintage and quite possibly will need a service. 
Please note we pack with our custom double box and bubble wrap system and we pack for the safety of the items not for economy 

Analogue reverb

Even­tide - Instant phaser and Harmonizer H910 Analogue reverb - Multiple models

Audio Equipment

Reserve price

No reserve price

Buy now

Budget

From

Closing date

12 April

Wednesday

Thursday

tomorrow

Monday

Tuesday

11 April

Friday

Location

The Netherlands

Italy

France

Belgium

Spain

Germany

Romania

Japan

Denmark

Portugal

Poland

Hungary

Hong Kong

Austria

United Kingdom

Ireland

Sweden

Greece

Switzerland

Croatia

Lithuania

Latvia

Malta

Slovenia

Brand

Sony

Bang & Olufsen

Philips

Technics

Pioneer

Marantz

Bose

Akai

Denon

Yamaha

Harman Kardon

Kenwood

Sansui

Onkyo

Grundig

Revox

Thorens

Luxman

Klipsch

Jamo

Bower & Wilkins

Dual

Object

Speaker set

CD player

Solid state integrated amplifier

Solid state stereo receiver

Hi-fi set

Cassette recorder-player

Radio

Record player

Solid state multi-channel receiver

Stereo set

Turntable

Tube radio

Speaker

Audio-cassette deck

Tuner

Solid state amplifier

Audio component

Subwoofer speaker set

Headphone

Solid state stereo amplifier

Reel to reel audio

Reel to reel deck 18 cm

Cartridge and/or needles

Equalizer

Walkman

Country of origin

Netherlands

Various countries

Material

Plastic

Aluminium

Gold-plated

Metal

Condition

Good

Excellent

Very good

Mint

Mint & Sealed (M&S)

Various conditions

Excellent (EX)

Mint (M)

Very Good Plus (VG+)

Good condition - used with small signs of ageing

Fair & Poor

Good condition - used with small signs of aging & blemishes

Near mint

Good condition

Excellent condition: barely used with minimal signs of wear

Extras

No extra's

Power cord

Remote control

+ Extra item (see description)

Power supply

Refurbished

Original user manual

Power Adapter

Brochures

Case

No cables

Gatefold

+extra item (see description)

Microphone Shock Mount

Flight Case

unboxed

Period

1980-1990

2010-2020

2000-2010

1990-2000

Style

Contemporary

Colour

Turquoise

Tested and working

Tested and working/playable

Not tested

Record Label

Unknown label

Original/ Replica

Original/official

Music memorabilia type

Box Set

1900-2000

After 2000

1400-1900

Creator

Japan & Related

Luigi Caccia Dominioni

Marco Zanuso

Franco Albini

Mario Bellini

Livio Castiglioni

Pier Giacomo Castiglioni

Achille Castiglioni

Dieter Rams

Richard Sapper

Very good - Number of items: 2 - Including: Audio component - No extra's

Generic - NAB aluminum wheel hub adapter Audio component

Mint - Number of items: 1 - Including: Headphone - Box, Power cord

Marshall - Major IV Headphone

Very good - Number of items: 1 - Including: Power Adapter

Kenwood - KX-880D - Amorphous Alloy Head - Direct Drive Computer Controlled - Cassette recorder-player

Number of items: 6 - Mint (M)

BASF DP26  & LP35 - 18 cm reels with tape - 1978

Very good - Number of items: 1 - Including: Solid state power amplifier - Power cord

Scientific Audio Electronics SAE - Mark Three A  power amplifier *rare* Solid state power amplifier

Good - Number of items: 2 - Including: Speaker set - No extra's

Boston - A250 Speaker set

Excellent - Number of items: 11 - Including: Hi-fi set - Power Adapter, Remote control, + Extra item (see description)

Kenwood, Music Box , PJ Miaolai - DP-X9010 - DAC 10 - PJ Miaolai P3 Hi-fi set - Multiple models

Excellent - Number of items: 2 - Including: Speaker set - + Extra item (see description)

Mordaunt & Short - Alumni 2 Speaker set

Excellent - Number of items: 1 - Including: Power Adapter

Sony - PS-X60 - FULLY AUTOMATIC - X TAL LOCK - NO RESERVE PRICE Record player

Very good - Number of items: 1 - Including: Solid state stereo receiver - Power cord

Sanyo - DCA 1001 - Stereo Pre-Main Amplifier - Vintage - "Silver Face" - Made in Japan Solid state stereo receiver

Audio Equipment

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Eventide - Instant phaser and Harmonizer H910 Analogue reverb - Multiple models

Popular in Audio Equipment

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Audio Equipment

This object is no longer available, but there’s still lots to explore

Even­tide - Instant phaser and Harmonizer H910 Analogue reverb - Multiple models

Popular in Audio Equipment

1214 objects

Related collections

Eventide - Instant phaser and Harmonizer H910 Analogue reverb - Multiple models