Category:Mid High Fidelity
Country of Manufacture:United Kingdom
Release dates:1964 - 1967
Speeds: 1 7/8, 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Stacked/Inline
# Motors: 3
Frequency Response:(all 3 dB): 7½ ips: 40Hz - 17kHz
Wow and Flutter:(better than) 0.1% at 7½ ips, 0.15% at 3¾ ips and 0.25% at 1 ips
Signal-to-Noise Ratio:better than 50dB
Sound quality rating:5 / 10
Long-term reliability rating: 5/ 10
Truvox was one of the first British firms to produce domestic recorders in the early days following the Second World War.
The 1964 series 90 covered a full range of recorders and decks including quarter and half-track machines, both monophonic and stereo. Pictured here is the R92 half-track mono recorder.
Common features to all series 90 machines were: piano key operation, a cathode follower output, recording level meter, positive lock reel carriers, 4 digit counter, hinged editing panel, input mixing facilities, sound-on-sound, 3 tape speeds, three motor drive with Papst capstan motor, horizontal operation and forward-facing Rola-Celestion loudspeaker (R92 &
Hum and noise: less than 45dB / Bias frequency: 62 KHz / Valve complement: EF86, ECC81, ECC83, ECC82 (oscillator), ECL86 and an EC25 metal rectifier / Rewind speed: 55 seconds for 1,200ft / Audio output power: 4 watts into 15 ohms / Inputs: microphone: 1.4 mV at 2.2Mohms. radio / P.U: 150 mV at 500Kohms / Outputs: cathode follower to ext. amp 100 ohms, output voltage variable to 1V / Speaker(s): 8″ x 5″ hyperbolic cone, high flux / Dimensions: 16½ x 17¾ x 8½ ” (419 x 452 x 216 mm) / Weight: 35 lbs (15.9 kg) / see text