Yamaha K-1a
Dolby B NR Full Logic Metal Tape

This Yamaha K-1a is a stereo cassette deck with Dolby B noise reduction, it was first sold by Yamaha in 1979 and discontinued a year later.

The main features of the Yamaha K-1a are: 2 heads, mechanical 3 digit tape counter and memory stop, manual tape type selection and capable of handling normal, chrome and metal tapes, belt driven single-capstan transport.

Typical front loading cassette deck with the cassette compartiment located on the left side of the deck. Tape eject is operated mechanically and the cassette needs to be placed with the side to be played facing forward in the cassette well which is opened by a damped mechanism.

Level meters used on the K-1a are generic digital peak reading meters. Full-logic transport controls used on the K-1a let it respond to the slightest finger contact for fast and effortless transport function selection.

The Dolby-B system reduces tape hiss on tapes recorded on the K-1a by as much as 10 dB at the highest frequencies. A Subsonic filter is provided in the K-1a to prevent infrasonic signals generated when playing a warped record. These signals can upset the Dolby system and prevening it from functioning properly. The 19kHz multiplex pilot slgnal present in FM stereo broadcasts can cause false triggering of the noise reduction system. The switchable MPX filter of the K-1a filters out the pilot signal, and assuring proper Dolby processing of FM stereo programs.

To make live recordings this deck has 2 microphone inputs to connect microphones with a jack connector. For undisturbed listening a jack connector for a pair of stereo headphones is supplied. Connection to other audio components for plaback can be achieved by a RCA cable and recording from a source by a RCA cable.

Compact Cassette
  • Natural Sound
  • Pure & Plasma Process head

Historic events

1979 The first commercial fully automated 1G (First Generation) cellular network was launched in Japan by NTT
1980 Worldwide sale of Rubik's Cube starts.

Features of Yamaha K-1a

Bias Fine Tune
Headphones RCA Input/Output Connectors 2 Mono Microphone Inputs
3-Digıt Mechanical Counter Digital Peak-Reading Meters
Normal Frequency Bias Oscillator Focus
Cassette Exterior
Front Loading Orientation Left Silver Finish
Compact Cassette
Head Configuration
4 Track / 2 Channel 2 Head Desiǥn
Chrome Tape Dolby B Metal Tape Normal Tape Play Record Record Mute
HighCom NR
Noise Reduction
Dolby-B Noise Reduction MPX Filter Subsonic Filter
Full Logic Transport Control Record Mute Line / Mic Input Select Timer Recording/Playback Damped Eject Memory Stop
Power Requirements
Alternating Current
Master Record Level Control Output-Level Control Record Level Balance Control
Tape Speed
1⅞ ips - 4.76 cm/s
Chrome Tape Capabılity Metal Tape Capabılity Normal Tape Capabılity Manual Tape Type Selection
Auto Shutoff Belt Drive (Capsŧan) Mechanical Tape Loading Sìngle Capsŧan Transport 2x Motor Mechanism

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