Category:Vintage (Pre 1960, some recorders were so good, they belong in above categories)
Country of Manufacture:UK
Release dates:1959 - 1962
Speeds: 3 3/4
Max Reel Size("): 7"
Number of heads: 2
Head Composition: Permalloy
Head Configuration: Mono - Full Track
Frequency Response:( 3 dB): 30 - 16,000 c
Wow and Flutter:better than 0.15%
Signal-to-Noise Ratio:Signal noise ratio: better than 55 db
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
Chitnis was one of the first British recorder manufacturers to recognise the potential of the new quarter-track stereo prerecorded tapes that were coming on to the market in the late 1950s and so he modified the single speed Elektron 9S deck by fitting twin amplifiers and sold them under his own name as the 9/SK4, renaming it the Chitnis “Audiograph 9/SK4 in 1960 .
These single motor, single speed recorders featured Bogen heads and were operated by a small central keyboard flanked by rotary gain controls. Only one small internal speaker was fitted for monitoring purposes but outputs were provided for external left and right speakers for full stereo reproduction.
Speed tolerance: better than 0.75% / noise ratio: better than 55 db / Rewind time: less than 2 minutes / Bias oscillator: approx. 50,000 c / s / Valve complement: 2 x EF86, ECC83, EC92, 2 x EL84 output, EM84 magic eye / Inputs: Microphone: 3mV / 2M ohm Radio: 3 mV / 100K ohm. Gramophone:, 100 mV / 1M ohm / Outputs: 2 x external speakers – 15Ω, external amplifier / line – 500mV 10KΩ / Speaker(s): single internal for monitoring / Dimensions: 13 x 10½ x 6 inches (330 x 267 x 152 mm) / Weight: 17½ lbs (7.952 kg) / quarter-track stereo