Category:Mid High Fidelity
Country of Manufacture:United Kingdom
Speeds: 3 3/4, 7 1/2, 15
Max Reel Size("): 10.5"
Number of heads: 4
Head Composition: Permalloy
Head Configuration: Stereo - Stacked
# Motors: 4
Frequency Response:30 & 15 ips: 50Hz - 15kHz (all 2 dB)
Wow and Flutter:total R.M.S. 7better than 0.15%
Signal-to-Noise Ratio:55 db unweighted
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
I imagine that The Beatles would have probably recorded their first studio demo tapes on these machines at the EMI studios way back back in 1962.
The following text comes from the original sales brochure –
The TR 90 can be presented in any of three basic configurations –
The transportable version is in two basic sections, the transport unit and amplifier unit. There are many variations to the basic model, such as half track, full track, dual track or stereophonic.
Total harmonic distortion: 2% (depending on tape used) reached 0 VU at 1kHz / Bias frequency: nominal erase & bias frequency – 100kHz / Valve complement (basic model): U709, 2 x ECC82, EF86, 6BW6, 3 x ECC81, 2 x ECC83, 1 x EZ80 / Rewind speed: approximately 1 minute for standard 10″ reel / Audio output power: 2 watts into 5 ohms or 10 watts into 15 ohms (optional) / Outputs: 600 ohm balanced line out / Recording level meter: VU meter with 3 position switch, line in, line out and record level. also used for bias testing / Dimensions (transportable version): two cases each 14½ x 20 x 16½” (368 x 508 x 419mm) / Weight (transportable version): two cases: 80 & 58 lbs (36.4 & 26.4 kg) / variable – see text