Repairs | Modifications

   Restorations | Customizations

Vintage Stage Electronics - Repairs & Modifications, Customizing & Occasions - in Berlin-Friedrichshain since 1990

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Walter Woods Bass Amps

IN/

CH/

OUT

Pilot

Light

Top&

Bott om

Panel

Configuration PSU/Pre&EQ/PowerAmp/

Output Power

Year

Regular Price








Early MI 100-4 Model (1 Version)




SMPS/Discrete/Class B-Bipolar










MI 100-4 = Min Amp 1 ?

2/1/1

Red

Black

1x 100W/4 Ohm or 1x 75W/8 Ohm

Oct.1972









Early MI 100-8 Models (6 Versions)




SMPS/Discrete/Class B-Bipolar










MI 100-8 "Single channel"

2/1/1

Red

Black

1x 100W/8 Ohm or 1x 150W/4 Ohm

Sept.1977


MI 100-8 "Dual channel"

2/2/1

Red

Black

1x 100W/8 Ohm or 1x 150W/4 Ohm

Sept.1977


MI 100-8 "Auxiliary power"

2/2/1

Red

Black

1x 100W/8 Ohm or 1x 150W/4 Ohm

Sept.1977


MI 100-8 "Quad channel"

4/2/1

Red

Black

1x 100W/8 Ohm or 1x 150W/4 Ohm

Sept.1977


MI 100-8 "Slave"

2/0/1

Red

Black

1x 100W/8 Ohm or 1x 150W/4 Ohm

Sept.1977


MI 100-8 "Stereo"

2/2/2

Red

Red


Sept.1977









Late MI 100-8 Models (3 Versions)




SMPS/IC/Class D-MOSFET










MI 100-8 "Single channel"

1/1/1

Red

Black

1x 100W/8 Ohm or 1x 150W/4 Ohm

1990-


MI 100-8 "Dual channel"

2/2/1

Red

Black

1x 100W/8 Ohm or 1x 150W/4 Ohm

1990-


MI 100-8  "Stereo"

2/2/2

Red

Red

2x 50W/8 Ohm

1990-









Early MI 225-8 Models (6 Versions)




SMPS/Discrete/Class D-Bipolar










MI 225-8 "Single channel"

2/1/1

Green

Black

1x 225W/8 Ohm or 1x 350W/4 Ohm



MI 225-8 "Dual channel"

2/2/1

Green

Black

1x 225W/8 Ohm or 1x 350W/4 Ohm



MI 225-8 "Auxiliary Power"

2/2/1

Green

Black

1x 225W/8 Ohm or 1x 350W/4 Ohm



MI 225-8 "Quad channel"

4/2/1

Green

Black

1x 225W/8 Ohm or 1x 350W/4 Ohm



MI 225-8 "Slave"

2/0/1

Green

Black

1x 225W/8 Ohm or 1x 350W/4 Ohm



MI 225-8 "Stereo"

2/2/2

Green

Red











MI 400-8

2/1/1

Amber

Black

1x 400W/8 Ohm or 1x 600W/4 Ohm



MI 400-8

4/2/1

Amber

Black

1x 400W/8 Ohm or 1x 600W/4 Ohm










MI 600-8

2/2/1

Blue

Black

1x 600W/8 Ohm or 1x 800W/4 Ohm










MI 700-8

2/2/1

Blue

Black

1x 700W/8 Ohm or 1x 1000W/4 Ohm










Late MI 200-8 Models (4 Versions)




SMPS/IC/Class D-MOSFET (?)










MI 200-8 LMH-Sweeper Mono

2/1/1

R?G?

Black

1x 300W/8 Ohm or 1x 450W/4 Ohm



MI 200-8 LMH-Sweeper Stereo

(Ext. Bridging possible)

2/1/2

R?G?

Red

2x 225W/8 Ohm or 2x 350W/4 Ohm










MI 200-8 Mid-Sweeper Mono

2/2/1

R?G?

Black

1x 300W/8 Ohm or 1x 450W/4 Ohm

1991-


MI 200-8 Mid-Sweeper Stereo (Ext.Bridg.)

2/2/2

R?G?

Red

2x 225W/8 Ohm or 2x 350W/4 Ohm

1991-









Early Electracoustic Models (16 Versions)




XLR DI Out










Electracoustic Lo Power (M-100)

2/1/1

Red

Black

1x 120W/8 Ohm or 1x 200W/4 Ohm

1995-

$1.099,00

Electracoustic Lo Power (M-100)

2/1/2

Red

Red

2x 100W/8 Ohm

1995-

$1.299,00

Electracoustic Lo Power (M-100)

4/2/1

Red

Black

1x 120W/8 Ohm or 1x 200W/4 Ohm

1995-

$1.299,00

Electracoustic Lo Power (M-100)

4/2/2

Red

Red

2x 100W/8 Ohm

1995-

$1.499,00








Electracoustic Hi Power (M-300)

2/1/1

Green

Black

1x 300W/8 Ohm or 1x 450W/4 Ohm

1995-

$1.399,00

Electracoustic Hi Power (M-300)

2/1/2

Green

Red

2x 225W/8Ohm or 2x350W/4 Ohm

1995-

$1.999,00


2/1/B



Bridged: 700W/8 Ohm or 1000W/4 Ohm



Electracoustic Hi Power (M-300)

4/2/1

Green

Black

1x 300W/8 Ohm or 1x 450W/4 Ohm

1995-

$1.599,00

Electracoustic Hi Power (M-300)

4/2/2

Green

Red

2x 225W/8Ohm or 2x350W/4 Ohm

1995-

$2.199,00








Electracoustic Super Hi Power (M-450)

2/1/1

Amber

Black

1x 450W/8 Ohm or 1x 650W/4 Ohm

1995-

$1.899,00

Electracoustic Super Hi Power (M-450)

2/1/2

Amber

Red

2x 350W/8 Ohm or 2x 550W/4 Ohm

1995-

$2.499,00


2/1/B



Bridge: 1100W/8 Ohm or 1500W/4 Ohm



Electracoustic Super Hi Power (M-450)

4/2/1

Amber

Black

1x 450W/8 Ohm or 1x 650W/4 Ohm

1995-

$2.099,00

Electracoustic Super Hi Power (M-450)

4/2/2

Amber

Red

2x 350W/8 Ohm or 2x 550W/4 Ohm

1995-

$2.699,00








Electracoustic Ultra Hi Power (M-800)

2/1/1

Blue

Black

1x 700W/8 Ohm or 1x 1000W/4 Ohm

1997-99

$2.199,00

Electracoustic Ultra Hi Power (M-800)

2/1/2

Blue

Red

2x 550W/8 Ohm or 2x 800W/4 Ohm

1997-99

$2.899,00


2/1/B



Bridge: 1600W/8 Ohm or 2200W/4 Ohm

withdrawn


Electracoustic Ultra Hi Power (M-800)

4/2/1

Blue

Black

1x 700W/8 Ohm or 1x 1000W/4 Ohm

1997-99

$2.399,00

Electracoustic Ultra Hi Power (M-800)

4/2/2

Blue

Red

2x 550W/8 Ohm or 2x 800W/4 Ohm

1997-99

$3.099,00








Late Electracoustic 2-Channel Models




(6+1 Versions, Phone Jack DI Out)










Electracoustic Lo Power (M-100)

2/2/1

Red

Black

1x 120W/8 Ohm or 1x 200W/4 Ohm

2000-

$1.299,00

Electracoustic Lo Power (M-100) Stereo

2/2/2

Red

Red

2x 100W/8 Ohm

2000-

$1.499,00








Electracoustic Hi Power (M-300)

2/2/1

Green

Black

1x 300W/8Ohm or 1x450W/4 Ohm

2000-

$1.599,00

Electracoustic Hi Power (M-300) Special

2/2/1

Green

Black

1x 700W/2Ohm

2000-

$1.499,00

Electracoustic Hi Power (M-300) Stereo

2/2/2

Green

Red

2x 225W/8Ohm or 2x350W/4 Ohm

2000-

$2.199,00


2/1/B



Bridged: 700W/8 Ohm or 1000W/4 Ohm










Electracoustic Super Hi Power (M-450)

2/2/1

Amber

Black

1x 450W/8 Ohm or 1x 650W/4 Ohm

2000-

$1.899,00








Electracoustic Ultra Hi Power (M-800)

2/2/1

Blue

Black

1x 800W/8 Ohm or 1x 1200W/4 Ohm

2000-

$2.399,00






















Happy News for all Walter Woods Owners:


Finally those little masterpieces in weight and conversion efficience can be repaired here in Berlin !


While Walter Woods in California singlehandedly develops, builds, sells, repairs, runs no website and

won’t hand out schematics I had to draw those schematics from PCB for my poor customers.

Countless hours have been supported by Michael Heupel, Gunnar Plümer and others. Many thanks go to them !


References Walter Woods Amps:


Rodolfo Stroeter (Celine Rudolph) - Walter Woods MI 100-8 Single Channel

Rodolfo Paccapello - Walter Woods MI 200-8

Michael Heupel - Walter Woods MI 225-8

Gunnar Plümer - Walter Woods MI 225-8

Klaus Axenkopf - Walter Woods Electracoustic Late M-450

Ulrich Fiedler - Walter Woods Electracoustic Late M-800, MI 100-8 Dual Channel, MI 225-8 Dual Channel

Andreas Lonardoni - Walter Woods MI 225-8

Edward Harris - Walter Woods MI 100-8 Dual Channel


Walter Woods Bass Amp Repair

Inquiry


I made a Walter Woods model overview for your convenience.


Corrections welcome.


SerialNo. is stamped on heatsink.

Serial number key until ca. 2006 (?): MMDDYY.

After then you will only find random 6-figure digit/letter combinations.