Optonica RT-6905 Computer Controlled Stereo Cassette Deck
This Optonica RT-6905 is a stereo cassette deck with Dolby B noise reduction, it was first sold by Optonica in 1979 with a manufacturer suggested retail price of USD $1,600 and discontinued 2 years later in 1981.
The main features of the Optonica RT-6905 are: 3 heads and off-tape monitoring, digital tape counter with 3 digits, manual tape type selection and capable of handling normal, chrome, ferro-chrome and metal tapes, belt driven dual-capstan transport.
Typical front loading cassette deck with the cassette compartiment located on the center 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.
Level meters used on the RT-6905 are generic digital peak reading meters with peak hold for easy adjustment of optimum recording level. Full-logic transport controls used on the RT-6905 let it respond to the slightest finger contact for fast and effortless transport function selection.
To ensure the best response from the wide variety of tapes available adjustment of, bias and sensitivity, to optimum levels can be performed prior to recording.
The Dolby-B system reduces tape hiss on tapes recorded on the RT-6905 by as much as 10 dB at the highest frequencies. 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 RT-6905 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. All main transport commands can be issued remotely with a wireless remote control.
- APMS (Automatic Programmable Music Sensor)
- APSS (Auto Program Search System)
- Metal (Metal Tape)
Historic events
Features of Optonica RT-6905
Manual Bias Calibration
Manual Level Calibration
2 Mono Microphone Inputs
Headphones
RCA Input/Output Connectors
Wireless Remote Control Receiver
Front Input Connector
3-Digıt Digital Counter
Digital Clock
Digital Peak-Reading Meters
Peak Hold
Peak Limiter
Record Protection
Front Loading
Black Finish
Orientation Center
Stereo
4 Track / 2 Channel
3 Head Desiǥn
Chrome Tape
Fast Forward
Ferro-Chrome Tape
MPX
Metal Tape
Normal Tape
Pause
Play
Record
Rewind
Dolby-B Noise Reduction
MPX Filter
Auto-Space
Music Scan
Real-Time Tape Monitoring
Timer Recording/Playback
Full Logic Transport Control
Memory Play
Memory Repeat
Individual Input Level Controls
Microphone Level Adjust (Left/Right)
Output-Level Control
1⅞ ips - 4.76 cm/s
Normal Tape Capabılity
Chrome Tape Capabılity
Ferro-Chrome Tape Capabılity
Metal Tape Capabılity
Manual Tape Type Selection
Mechanical Tape Loading
Auto Shutoff
Belt Drive (Capsŧan)
Dual-Capstan Transport
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Similar to Optonica RT-6905 from the period 1979 - 1981
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