TECHNICS RS B905 FOR SALE PRO
The HX Pro circuitry continuously monitors the signal being fed to the record head, and when it detects treble levels that would result in tape saturation (a serious problem at the 1-7/8-ips cassette tape speed), it instantly lowers the record bias slightly. The Dolby HX Pro headroom-expansion system also extends high-frequency response at high signal levels. Such a design also allows the use of a relatively wide head gap for the record element, yielding a better signal-to-noise ratio, while using a narrow head gap for playback, yielding improved high-frequency response. A small difference in the capstans' diameters gives them slightly different rotational speeds, which produces the tape tension that holds the tape against the heads (The cassette's pressure pad exerts additional tension, of course, but from an engineering viewpoint the pad is superfluous in a closed-loop transport.) A second DC motor drives the two reel hubs.Īlthough they share a common casing, the record and playback heads of the RS-B905 are electrically separate units, which allows the user to make instant quality comparisons between the source signal and its just-recorded counterpart. The take-up and supply-side capstans of the RS-B905 are belt-coupled and are driven by a DC servomotor. As the flagship deck of the Technics line, the RS-B905 also incorporates phase-compensation circuitry to improve stereo imaging, a user-adjustable bias control, and separate tape-sensitivity controls for each channel.
Dolby HX Pro headroom expansion, dbx and Dolby noise-reduction systems, separate record and playback heads, and a closed-loop, dualcapstan drive system are among the many attractions of the new Technics RS-B905 cassette deck.
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