Country of Manufacture:
Speeds: 1 7/8, 3 3/4
Max Reel Size("): 7"
Number of heads: 2
Head Composition: Permalloy
Head Configuration: Mono - Full Track
Frequency Response:( 3 dB): 3¾ ips: 30 - 16,000 c
Wow and Flutter:0.12% at 3¾ ips
Signal-to-Noise Ratio:better than 55 db
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
The TB491 was a quarter-track mono recorder with two-speed (3¾ and 1 ips) and a single Papst motor.
Fitted with Bogen heads it boasted a true Hi-Fi frequency response of 30-16,000 cps at 3¾ ips.
Features included superimposing, pause, monitor, and input mixing. A small internal speaker was incorporated but facilities were provided for connecting an external hi-fi speaker for superior reproduction. It was also available in a two-track version. The TB491 deck was used in the UK-produced Chitnis KM22 and KM33 recorders.
Speed tolerance: better than 0.75% / Rewind time: less than 2 minutes / Bias oscillator: approx. 50,000 c / s / Valve complement: EF86, ECC83, EC92, EL84 output, EM84 magic eye / Inputs: Microphone: 3mV / 2M ohm Radio: 3 mV / 100K ohm. Gramophone:, 100 mV / 1M ohm / Speaker(s): single internal / Power requirements: 110, 127 or 220V / Dimensions: 14.2 x 13 x 7.9 inches ( 360 x 200 x 330 mm) / Weight: 21.2 lbs (9.6kg) / : / quarter and half track mono