Category:Mid High Fidelity
Country of Manufacture:USA
Release dates:1964 - 1967
Speeds: 1 7/8, 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 2
Head Composition: Permalloy
Head Configuration: Mono - Full Track
Frequency Response:(all 3 dB): 7½ ips: 40-16kHz
Wow and Flutter:less than 0.2% at 7½ ips. 0.35% at 1 ips
Signal-to-Noise Ratio:better than 50dB
Sound quality rating:5 / 10
Long-term reliability rating: 5/ 10
Styled in a very similar
manner as the earlier model 220, the 550 was also of a hybrid design,
utilising 2 x 2SB173A, 2 x 2SB175A and 2 x SB177A transistors, and 3 x
3OA5 tubes plus 2 x OA7O diodes and a KCO.8C Selenium Rectifier.
The 550 was a three speed, two head machine with built in stereo 5 watt
amplifiers and a pair of 6″ x 4″ speakers, one in the front
of the unit and the other in the detachable lid.
Pushbutton controls were provided for all transport functions, twin miniature
VU meters for record level and a three-digit tape location counter were
among other features.
Total harmonic distortion: less than 2% / Audio output power: 5 watts per channel / Inputs: 1 microphone, 1 aux / Outputs: external speaker, line / Speaker(s): two 4″ x 6″ wide-range internal / Weight: 40 lbs (18.2 kg) / quarter-track stereo