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B77 Specification

 

 

 

 

Tape transport mechanism:

3 motor tape drive; 2 AC driven spooling motors; 1 AC driven capstan motor, electronically regulated

 

Tape speeds:

3.75 ips and 7.5 ips, electronic change-over, tolerance from nominal +-0.2%

With optional vari-speed speed variable from 2.5.....11 ips

 

Wow and flutter:

(as per DIN 45507)

At 3.75 ips <0.1%, at 7.5 ips <0.08%

 

Tape slip:

Maximum 0.2%

 

Reel size:

Up to 10.5 diameter (minimum hub diameter 2.36)

Tape tension switchable for small hub diameters

 

Winding time:

Approximately 135 seconds for 3,600 ft of tape

 

Tape transport control:

Integrated control logic with tape motion sensor provides for any desired transition between different operating modes. Contactless electronic switching of all motors. Remote control of all transport functions and electronic timer operation are possible

 

Equalization:

(as per NAB)

3.75 ips: 90 microsec/3180 microsec

7.5 ips: 50 microsec/3180 microsec

 

Frequency response:

(measured via tape at -20 VU)

3.75 ips 30Hz.....16kHz +2/-3dB

50Hz.....10kHz +-1.5dB

7.5 ips 30Hz.....20kHz +2/-3dB

50Hz.....15kHz +-1.5dB

 

Peak recording level:

514 nWb/m corresponds to 6dB above 0VU

 

Level metering:

VU meter as per ASA standard, with LED peak level indicators

 

Distortion:

3.75 ips at 0VU <1%, at 0VU+6dB <2.5%

7.5 ips at 0VU <0.6%, at 0VU+6dB <1.5%

 

Signal to noise ratio:

(weighted as per ASA-A)

Half track

3.75 ips >64dB

7.5 ips >67dB

 Quarter track

3.75 ips >60dB

7.5 ips >63dB

 

Crosstalk:

At 1kHz stereo >45dB, mono >60dB

 

Erase depth:

At 7.5 ips >75dB

 

Inputs per channel:

MIC LO 0.15mV/2k2ohms for low impedance microphones

MIC HI 2.8mV/110kohms for high impedance microphones

RADIO 2.8mV/20kohms

AUX 40mV/220kohms

 

Outputs per channel:

(Level at 6dB above 0VU)

OUTPUT 1.55V/390ohms adjustable with preset

RADIO 1.55V/4k7ohms adjustable with preset

PHONES 5.6V/220ohms adjustable with control

 

Connectors for:

Remote control of tape transport

Remote control of variable tape speed

Slide projector or crossfade unit (electronics optional)

 

Components:

11 ICs, 1 opto-coupler, 4 triacs, 60 transistors, 33 diodes, 5 LEDs, 2 full wave rectifiers, 3 relays

 

Electric current supply:

100.....240V ~ +-10%

Voltage selector for 100V, 120V, 140V, 200V, 220V, 240V

50.....60Hz without conversion, maximum power 80 watts

Main fuse 120V 1A slow-blow, 240V 0.5A slow-blow

 

Weight:

Approximately 17kg

 

Dimensions:

452 x 414 x 207 mm (W x H x D)

Clearance required for 10.5 reels height 464mm, width 538mm

 

The B77 head block