Released in 1979, the Pioneer CT-F1250 was a three-head stereo cassette deck developed as one of Pioneer’s most advanced recording machines. It combined a quartz-controlled direct-drive transport, closed-loop dual-capstan tape handling, Dolby B noise reduction and extensive electronic control with Pioneer’s EqLB tape-calibration system. Independent adjustment of bias, recording level and equalisation allowed the deck to be matched closely to Type I, ferrichrome, chromium dioxide and metal cassette formulations.
The magnetic properties of cassette tape could vary between manufacturers and even between apparently identical cassettes. These variations affected the optimum bias, recording level and equalisation required for recording. Most cassette decks compensated only for broad tape categories, leaving no means of aligning the recording system precisely to an individual cassette.
Pioneer addressed this limitation through the EqLB tuning system fitted to the Pioneer CT-F1250. Three separate controls allowed bias, recording level and equalisation to be adjusted independently. The calibration system provided visual indicators for each parameter, enabling the operator to align the recording electronics without relying solely upon the fixed tape-type selector.
Once a cassette had been inserted, the calibration mode was selected and the relevant control adjusted until both corresponding indicator lights illuminated simultaneously. The same process was repeated for bias, level and equalisation. When all three adjustments had been completed, the recording system was matched to the tape in use.
The EqLB system supported the principal cassette formulations available at the time, including Type I, ferrichrome, chromium dioxide and metal tape. This enabled the Pioneer CT-F1250 to account for variations between individual tape products rather than treating every cassette within a category as having identical characteristics.
The transport employed a quartz-controlled direct-drive capstan motor. Quartz regulation maintained the capstan speed with a high degree of stability, contributing to a specified wow and flutter figure of 0.03%. Pioneer used a separate reel motor for the winding functions, allowing the capstan system to concentrate on maintaining stable tape motion during recording and playback.
A closed-loop dual-capstan arrangement controlled the cassette tape as it passed the heads. The drive and tension capstans maintained the tape at the required tension, reducing the influence of the cassette shell, pressure pad and internal tape movement upon the active recording and playback path.
The two capstans were linked so that they rotated at the same speed. This arrangement helped prevent slack or stretching between the capstans and supported consistent tape contact with the heads. Pioneer also incorporated automatic tape-slack control to reduce the possibility of loose tape becoming caught within the mechanism.
The Pioneer CT-F1250 used a three-head system, allowing recording and playback functions to be handled independently. The separate playback function enabled the recorded signal to be monitored directly from the cassette while recording was taking place. The operator could therefore compare the incoming source with the signal reproduced from the tape without stopping or rewinding.
Pioneer manufactured the recording and playback heads from its Uni-X’Tall ferrite-based material. This was selected for its electrical and wear characteristics. The head system contributed to the deck’s specified metal-tape frequency response of 20Hz to 20kHz.
The erase system used Pioneer’s compact small-window head design. This head accessed the tape through the smaller openings in the cassette shell, leaving the larger openings available for the pinch rollers used by the closed-loop dual-capstan transport.
The erase-head arrangement was designed to pass over the tape twice, reducing residual low-frequency magnetic content. Pioneer specified an erasure performance of 80dB for metal tape in its promotional description of the Pioneer CT-F1250.
Dolby B noise reduction was provided for compatible recording and playback. When engaged, the system improved the specified signal-to-noise ratio to 69dB. A front-panel filter control accompanied the Dolby system for use where required.
The large illuminated meter display showed the recording and playback levels of the left and right channels. The metering system could be switched between peak, peak-hold and average modes, allowing the display behaviour to be selected according to the type of programme material and the operator’s preference.
Separate dim and bright controls were provided for the meter and counter illumination. The blue display panel also contained indicators for Dolby noise reduction, memory and repeat functions, tape formulation and the three EqLB calibration parameters.
A four-digit electronic tape counter provided a numerical indication of tape position. The counter worked with the deck’s electronic memory and repeat systems, which included memory stop, memory play, counter repeat and end repeat functions.
Timer-start controls allowed the Pioneer CT-F1250 to begin playback or recording when connected to suitable external timer equipment. Separate Play, Record and Off settings were provided for timer-controlled operation.
The transport controls were arranged below the cassette mechanism and included fast rewind, fast forward, stop, playback, record, pause and record mute. Indicator lamps showed the status of the principal recording and transport functions.
The cassette mechanism opened vertically, exposing the cassette reels and tape path. The upper calibration-system panel and lower head-and-transport section formed a two-part mechanism that gave the Pioneer CT-F1250 its distinctive appearance.
Separate microphone and line input controls were provided for the left and right channels. The microphone and line circuits had individual front-panel level controls, allowing the connected source to be matched to the recording system.
Two microphone sockets were fitted to the lower-right section of the front panel. A headphone connection allowed direct monitoring, while a separate output-level control adjusted the reproduced signal without changing the recording-level settings.
A source-and-tape monitor selector allowed the incoming programme to be compared with the recorded signal reproduced from the cassette. This direct monitoring facility was one of the principal advantages of the deck’s three-head configuration.
The Pioneer CT-F1250 also included a pitch-control adjustment. This allowed the tape speed to be varied when required, providing a means of correcting or deliberately altering the pitch of reproduced material.
With its quartz-regulated transport, closed-loop dual-capstan mechanism, three-head monitoring, Dolby B noise reduction and individually adjustable bias, level and equalisation, the Pioneer CT-F1250 was an exceptionally comprehensive cassette deck. Its combination of precision tape handling, manual calibration and extensive electronic operating functions placed it among Pioneer’s most accomplished cassette recorder designs.
Features
- Three-head stereo cassette recording and playback
- Direct off-tape monitoring during recording
- Pioneer EqLB tape-calibration system
- Independent bias, recording-level and equalisation controls
- Visual calibration indicators
- Type I, ferrichrome, chromium dioxide and metal-tape compatibility
- Quartz-controlled direct-drive capstan motor
- Separate reel motor
- Closed-loop dual-capstan tape transport
- Automatic tape-slack control
- Uni-X’Tall ferrite-based recording and playback heads
- Compact small-window erase head
- Dolby B noise reduction
- Source and tape monitoring
- Peak, peak-hold and average meter modes
- Adjustable display brightness
- Four-digit electronic tape counter
- Memory stop and memory play functions
- Counter and tape-end repeat modes
- Timer-controlled recording and playback
- Record mute function
- Independent left and right microphone-level controls
- Independent left and right line-level controls
- Front-panel microphone inputs
- Headphone output
- Adjustable output level
- Pitch control