The Sony EL-5 was introduced in 1976 as a stereo tape recorder for Sony’s ELCASET format, combining the enclosed convenience of a cassette with a wider tape and a higher operating speed than the compact cassette. Designed as a standard two-head Elcaset deck, the Sony EL-5 combined a four-track, two-channel recording system with electronic transport control, a frequency-controlled servo motor, Dolby noise reduction and comprehensive facilities for recording, monitoring and timer operation.
The Sony EL-5 used a logic-controlled transport built around a dedicated electronic circuit and electromagnetic solenoid. By replacing much of the mechanical transmission normally required in a single-motor recorder with electronic control, Sony simplified the transport mechanism while providing feather-touch operation. The individual transport controls allowed the user to operate rewind, fast forward, stop, play, record and pause functions without applying substantial mechanical force to the controls.
A mechanical tension regulator was incorporated to improve tape-running accuracy and maintain controlled tape movement through the transport. The Sony EL-5 also used a scrape filter designed to absorb tape vibration and shorten the unsupported vibrating span of the tape. This arrangement shifted modulation noise beyond the audible range and supported more stable tape-to-head contact during recording and playback.
The recording and playback head was Sony’s solid-core F&F ferrite head. Rather than using ferrite only for the core, the design employed a single, non-laminated ferrite plate for both the core and guard sections. This construction reduced the possibility of displacement and recording-gap deviation while improving phase and frequency characteristics. A separate erase head completed the two-head configuration.
Sony directly coupled the F & F recording and playback head to the playback amplifier through field-effect transistors. Eliminating an intermediate coupling stage helped improve the signal-to-noise ratio, frequency response and distortion performance. The deck used two FETs alongside 82 transistors, four integrated circuits, 60 diodes and one LED within its electronic design.
The transport was driven by a frequency-controlled servo motor equipped with an FG frequency generator. The frequency generator was connected directly to the motor shaft and detected changes in rotational speed from variations in the generated frequency. The servo circuit then corrected these deviations to maintain stable tape speed. This arrangement reduced the influence of electrical fluctuations and helped maintain rotational stability despite changes caused by temperature or supply conditions.
The Sony EL-5 operated Elcaset tape at 9.5cm/s and provided a recording time of 60 minutes in both directions when used with an LC-60 cartridge. Fast-forward and rewind time for an LC-60 tape was specified at 75 seconds. A photoelectric auto-shut-off system stopped the transport at the end of the tape, while a safety-lock mechanism protected against unsuitable operating combinations.
The deck incorporated Dolby noise reduction for reducing audible tape noise during recording and playback. An MPX filter could be switched into the signal path to remove unwanted pilot-tone signals when recording FM stereo broadcasts. Bias and equalisation could be selected independently through a three-position tape selector, allowing the Sony EL-5 to accommodate the supported Elcaset tape formulations.
Frequency response was specified at 25Hz to 20kHz within ±3dB using Type II DUAD tape, with an extended response of 15Hz to 25kHz also quoted for Type II DUAD tape. The signal-to-noise ratio was specified at 59dB using Type I SLH tape and 62dB using Type II DUAD tape, measured at 315Hz peak level. Wow and flutter was rated at 0.06% weighted RMS, while distortion was specified at 0.8% with Type II tape.
Separate bias and equalisation selectors were positioned on the front panel alongside the Dolby and MPX filter controls. Twin illuminated VU meters provided independent indication for the left and right channels, while separate recording-level controls were supplied for line and microphone sources. The microphone control could balance the left and right microphone inputs, and the line-level control provided corresponding adjustment for stereo line sources.
The Sony EL-5 allowed microphone and line signals to be mixed during recording. A front-mounted stereo line input was also provided and took priority over the corresponding rear-panel input when connected. Separate left and right microphone sockets, the front line input and the associated level controls made it possible to prepare recordings directly from the front panel without relying solely on rear connections.
A dedicated headphone output was accompanied by an independent headphone level control, allowing the monitoring volume to be adjusted separately from the main output. The deck also included a memory stop and play mechanism. When rewinding to the counter position 999, the transport could stop automatically and then begin playback, providing a convenient method of returning to a predetermined section of the tape.
Timer-controlled operation was supported for unattended recording and automatic playback when the Sony EL-5 was connected to a separately available timer. The deck could therefore be configured for unattended broadcast recording or used for automatic playback at a selected time. Follow-up recording was also supported.
The optional Sony RM-30 wired remote controller provided remote transport operation and record muting. The remote controller was sold separately and allowed the main operating functions to be controlled away from the front panel.
The cassette compartment used a soft-eject mechanism for controlled opening and removal of the Elcaset cartridge. The large front-loading compartment provided access to the enclosed tape format while protecting the tape during normal handling. The substantial operating controls, illuminated meters and clearly separated recording controls reflected the deck’s emphasis on direct operation and monitoring.
The Japanese-market Sony EL-5 operated from a 100V AC, 50Hz or 60Hz supply and consumed 33W. It also included two switched AC outlets with a combined capacity of 200W and one unswitched outlet rated at 300W. Measuring 170mm high, 430mm wide and 320mm deep, and weighing 10.5kg, the Sony EL-5 was a substantial recorder whose construction reflected the larger Elcaset mechanism and its extensive control system.
The Sony EL-5 represented the standard model within Sony’s original Elcaset recorder range. Its combination of a frequency-controlled servo transport, solid-core ferrite head, Dolby noise reduction, independent tape selection, memory operation, front-panel mixing and timer facilities provided a comprehensive recording system for the short-lived large-cassette format.
Features
- Four-track, two-channel stereo Elcaset recording system
- Logic-controlled transport using a dedicated electronic circuit and electromagnetic solenoid
- Feather-touch transport controls
- Mechanical tape-tension regulator
- Scrape filter for reducing audible modulation noise
- Solid-core F & F ferrite recording and playback head
- Direct-coupled FET playback amplifier
- Frequency-controlled servo motor with integral frequency generator
- Photoelectric auto-shut-off mechanism
- Dolby noise reduction
- Switchable MPX filter
- Independent three-position bias and equalisation selection
- Memory stop and automatic playback function
- Microphone and line-input mixing
- Front stereo line input with priority over the rear input
- Separate microphone and line recording-level controls
- Independent headphone level control
- Timer-controlled unattended recording and automatic playback
- Follow-up recording capability
- Optional RM-30 wired remote control with record muting
- Safety-lock mechanism
- Soft-eject cassette mechanism
- Twin illuminated VU meters