WORLD AC BUILD IN 120/220/240V. Aiwas AD-6900 was at the time of its launch one of the most expensive and sophisticated hi-fi stereo cassette decks in the world. Its hard to understate the significance it had to any tape fan, back then. It was more than just a machine to record music with, it was a veritable declaration of intent about what the Compact Cassette format could do. Hugely sophisticated, brilliantly engineered and built, it had open reel enthusiasts wondering how long they could hold out before cassette took over.
The engineering inside this deck is staggering. Take the top off the 450x120x327mm case and youll see it is jam-packed with electronics, including 13 integrated circuits, 160 transistors, 85 diodes and 12 FETs.
The quality of components is very good indeed, as are the two motors one for the drive reel, one for the capstan. Its three heads are excellent too, comprising a ferrite erase head and a siamesed record/playback one. This is high precision design running a four micron gap on the record head and a one micron gap on the playback optimal sizes for each. The key improvement was its new Metal tape compatibility; this gave a staggering 20Hz to 20kHz [at -3dB] frequency response.
The V-cut profile of the head was said to reduce low frequency irregularities caused by the physical interaction of the tape and the playback head. Both heads sat on the same 4-point stabilized die-cast alloy base, to keep azimuth between the two perfect. Typical front loading cassette deck with the cassette compartment 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. Level meters used on the AD-6900MKII are analog needle VU reading meters with peak hold for easy adjustment of optimum recording level. Full-logic transport controls used on the AD-6900MKII let it respond to the slightest finger contact for fast and effortless transport function selection.Cue and review can be used to easily and quickly locate the beginning of a passage. To ensure the best response from the wide variety of tapes available adjustment of, sensitivity, to optimum levels can be performed prior to recording. The Dolby-B system reduces tape hiss on tapes recorded on the AD-6900MKII by as much as 10 dB at the highest frequencies. The three-head configuration of the AD-6900MKII requires a Double Dolby system, one for recording and one for playback.
The 19kHz multiplex pilot signal present in FM stereo broadcasts can cause false triggering of the noise reduction system. The switchable MPX filter of the AD-6900MKII 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 playback 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. Sonically the AD-6900 is quite superb.
With a good Chrome tape, you can record high levels on to it and theres an eerie lack of the usual nasties you associate with cassette. Pitch is very stable, treble is crisp and open, and the bass is strong and gutsy. Midband is surprisingly detailed and transparent, and sound staging is excellent. It is one of the few cassette decks I have heard that genuinely sounds near-peer to a serious open reel tape recorder, it really is that good.
For example, you can record from a high quality turntable, play it back and find yourself assuming that youre listening to the turntable, if you dont consciously remind yourself. Along with the special head arrangement, the other standout feature of the AD-6900 is the Flat Response Tuning System, working in conjunction with a pair of novel, dual-needle meters. At the time that this deck came out, FRTS was the most advanced bias and record calibration adjustment system of its type, by a long way.
It allowed users to set the deck up accurately for any type of tape on sale be it Ferric, CrO2 or FeCr. It had both low and high frequency oscillators feeding test tones onto the tape at -15 VU at 400Hz and 8kHz; this made for ultra-precise bias calibration. Three adjusters were fitted to the front panel, meaning that users could effectively have preset bias and record calibration presets for three types of tape.The dual meters were unique at the time, showing both VU and peak recording and playback levels, as well as being used by the FRTS for tape set-up. Elsewhere, the high attention to detail continues. Theres a 38-pulse frequency-generated servo motor; the complex discrete transistor logic control circuitry allows one-touch cue/review without leaving play mode. The fitment of robust Ferrite heads means that the user head wear associated with this, is not an issue. The power supply uses a toroidal transformer instead of the then-standard frame type.
Overall build quality was excellent, the Aiwa being one of the heaviest cassette decks made at 9.8kg. Wow and flutter was quoted at an extremely low 0.04%, and signal to noise ratio a superb 68dB (with Dolby B).
The item "80s KING NEW AIWA AD-6900 MKII 3-Head Tapedeck Cassette REMOTE +SIDE PANELS" is in sale since Thursday, May 21, 2020. This item is in the category "TV, Video & Audio\Heim-Audio & HiFi\Tapedecks/Tonbandspieler". The seller is "ikebana007" and is located in Dublin. This item can be shipped worldwide.