Model:77 'Stereo Compact'
Country of Manufacture:USA
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 2
Head Composition: Permalloy
Head Configuration: Stereo
Frequency Response:7½ ips: 25Hz - 16kHz
Wow and Flutter:0.2% RMS
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
Made by the Viking company of Minneapolis, the model 77 (which replaced the model 76) was a quarter-track, stereo tape deck with two heads and a two-speed transport utilizing a single motor.
The single rotary function knob can be seen at the top right of the deck showing Rewind, Stop, Play and Fast forward positions. Other controls included record volume for each channel, twin VU meters for recording level, speed selector switch (in between the reels) a stereo/mono switch and an On/Off, Play or Record selector control.
This unit was designed for custom installations and used 5 valves (tubes).
Total harmonic distortion: less than 2% / Valve complement: 12AX& (ECC83) x 4. 12AU7 x 1 / Rewind speed: 70 seconds for 1800 feet / Inputs: microphone (front panel), high-level input (back) / Outputs: amplifier output / Dimensions: panel size: 13 x 13″ (326 x 326 mm) / Weight: 21 lbs (9.5 kg) / quarter-track stereo