General Information

Serial #

721125

Part Number

1

Total Parts

1

AKA

Charge Amplifier

Patents

N/A

General Description

Metal casing and connector pieces with hard synthetic knobs and switches.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

23.0 cm

Width

3.5 cm

Height

13.8 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Communications

Category

Sound

Sub-Category

N/A

Manufacturer

AKA

Bruel Kjaer

Country

Denmark

State/Province

Unknown

City

Copenhagen

Context

Country

Canada

State/Province

Ontario

Period

1978-1998

Canada

Bell Northern Research, was the research and development subsidiary of Northern Telecom (later Nortel Networks) and Bell Canada. It was built by Northern Telecom at its Trans-Canada plant in Montreal. Northern Telecom and its predecessor, Northern Electric, was for decades Canada’s largest manufacturer of telecommunications equipment. Originally a subsidiary of the AT&T-owned Western Electric, for which it manufactured American-designed products for the Canadian market, Northern Electric became Canadian-owned in the 1950s and in the 1960s began to design and produce equipment to meet the distinctive needs of Canadian telecommunication companies. In the 1970s, through its new research subsidiary, Bell Northern Research, the company made a concerted shift from conventional analogue equipment into the emerging field of digital communications, becoming in the 1980s the first equipment supplier to provide a complete line of fully digital switching and transmission gear. During this decade the company moved aggressively into export markets, and opened manufacturing and R&D operations in several countries. The company’s sales soared during the internet boom of the 1990s, but a combination of poor financial decisions and a failure to maintain its technological edge led eventually to its bankruptcy in 2009. The original Bell Northern facilities were designed with cutting edge telecommunications research and development in mind with the first three buildings on the campus featuring laboratories, an extensive research library, and an anechoic chamber. The anechoic chamber was the focal point of the Bell Northern Research acoustics research examining both the technology and placement of speakers and microphones in telecommunication devices. The anechoic chamber group was organized under the Industrial Design and working together with design were responsible for the development of the acoustic properties of most products. (From the Acquisition Proposal, see Ref. 1)

Function

Used as a pre-amplifier. (From the Acquisition Proposal, see Ref. 1)

Technical

Used in conjunction with other Bruel & Kjaer equipment to build an experimental acoustic apparatus. (From the Acquisition Proposal, see Ref. 1)

Area Notes

Unknown

Details

Markings

On the proper front: "Charge Amplifier/ Type 2651/ Sensitivity mV/pC/ LLF/ 1Hz/ 0.1/ 1/ 10/ LLF/ 1 Hz/ 10/ 0.3 Hz/ LLF/ 1/ 0.03 Hz/0.1/ 0.003 Hz/ LLF/ Floating/ Grounded/ Input/ Vel./ x 0.01 s/ Acc./ x 1/ Overload/ Reset/ Brüel & Kjaer/ Copenhagen/ [logo]/ Input/ Output"/ Inscribed into the proper top casing: "L 13305 BNR"/ On the proper back: "Output/ + Vb/ +/ - Vb/ SERIAL NO./ 721125/ Made in/ Denmark/ On the gold coloured connector on the proper back: "FR CANNON 7613/ DAM - 11W1P"/ Stickers on the proper right casing: "[logo]/ BRUEL & KJAER CANADA LTD./ 90 Leacock Road, Pointe Claire, Qué./ MODEL 2651/ VOLT/ HZ/ VA/ PURCHASE/ DATE/ February/78/ FUSE"/ "BNR [logo]/ ACOUSTIC DESIGN"/ "nt/ FOR/ INDICATION/ ONLY"/ "Bell-Northern Research [logo]/ L0013305"

Missing

Appears complete

Finish

Predominantly black casing with a light green panels on the proper front and back. On the proper front are black markings, knobs, and switches and white and silver coloured metal connectors. On the top there is a small round green sticker and a number inscribed into the metal, revealing the silver coloured metal underneath. On the proper back there are black markings, silver coloured and gold coloured connectors, and a black and silver coloured plate. On the proper right side is a collection of stickers: a blue and white sticker with white and black markings, a white and purple sticker with black markings, a pink sticker with black markings and a grey sticker with black markings.

Decoration

N/A