Shure SH55 Series II [46/48] Historic documents

Unidyne History - Internal Windscreen Material

Cloth (including silk, cotton, nylon, polyester, and others) has been used in Shure microphones since the 1930s.

Cloth was, and is, chosen based on availability, price, durability, color, ability to handle adhesives, and acoustical

characteristics. Documents from Shure Engineering provided the following details about the cloth.

1944

Cloth- “Ninon” or “Chiffonese #101”

Colors - Black (Shure part #10A28A); White (10A28B); Azure Blue (10A28C)

Acoustical resistance of material shall be 1 ohm (maximum) per square centimeter.

1947

Cloth- “Organza” cloth supplied by Vogue Fabric, Evanston, Illinois.

Shure engineers would visit the Vogue Fabric store with a device, a manometer, that measured acoustical resis-

tance.

New colors - Maroon (10A28D); Victoria Blue (10A28E)

1948

This cloth shall consist of 80 threads per square inch.

The space between adjacent parallel threads must not exceed 0.011 inch.

1955

New colors - Red (10A28F); Brown (10A28G)

1958

New color - Gray (10A28H)

1972

New colors - Any Solid Color (10A28J); Royal Blue (10A28K); Dark Blue (10A28L); Any Solid Dark Color

(10A28M); Navy (10A28N)

Model 55S

1951 to 1961 - Cloth color was Victoria Blue (10A28E)

1961 - Cloth color changed to Black (10A28A)

Model 556S

1954 - Cloth color was Maroon (10A28D) or Red (10A28F); both colors were used based on availability.

COLOR SHADES

The blue color from the 1940s was similar to Pantone color 2748 U (U = uncoated) .....................

The maroon color from the 1940s was similar to Pantone color 222 U. .........................................

The blue color from the 1950s was similar to Pantone color 2756 U. ...........................................

The red color from the 1950s was similar to Pantone color 187 U. ...............................................

The dark blue color from the 1970s was similar to Pantone color 2768 U. ....................................

Note: The color name would typically change when a new material/supplier replaced the previous material/supplier.

HISTORIC DOCUMENTS