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Yamaha K-720

Stereo Cassette Deck (1985-88)

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Yamaha K-720


4-track, 2-channel recording and playback stereo cassette tape deck with auto-reverse and Dolby B and C noise reduction


Type: auto reverse, 2-head, single compact cassette deck

Track System: 4-track, 2-channel stereo

Tape Speed: 4.76 cm/s

Heads: 1 x record/playback, 1 x erase

Motor: 1 x reel, 1 x capstan, 1 x mechanism

Tape Type: type I, CrO2, Metal

Noise Reduction: B, C, DBX, HX Pro

Frequency Response: 30Hz to 20kHz  (Metal tape)

Signal to Noise Ratio: 90dB  (DBX)

Wow and Flutter: 0.08%

Total Harmonic Distortion: 1.0%

Input: 45mV (line), 0.4mV (mic)

Output: 0.36V (line)

Dimensions: 435 x 113 x 302.5mm

Weight: 5.7kg

Year: 1985


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Reviewed Mar 10th, 2016 by RonGinsberg

I purchased mine new in 1986 and I've had it since. It stopped working about 5 years ago. I think the motor went. I had it repaired, it was expensive but worth it. It is now as good as new.

It is a very high quality unit with wonderful sound. It has the capability to record with dbx, dolby B or dolby C. With dbx it could make extremely low noise recordings on either metal or chrome type tapes. The recordings were virtually indistinguishable from the source material (either records or FM). I tried A/B tests with records. I was using a Shure V15 Type V MRx cartridge. It was really quite good, and I tried it with a friend who was switching back and forth. I really could not tell.

I still listen to those old tapes and they still sound wonderful. People are amazed that the tapes can be as much as 38 years old (recorded on an older Akai machine in dolby B) and the sound is still Hi-fi.

The machine has a number of nice features such as a fast auto-reverse which detects the beginning of the leader and does a fast reverse before it gets to the end of the reel. It barely interrupts the music since it works in record and playback mode. You can skip to the next song, insert blanks, fade etc. When it is done playing it will also switch to source. So if, say your receiver is playing FM and outputting FM to the record out source, and you play a tape, when the tape is finished, the deck will automatically switch to the FM. You can even play a program. You can choose which tracks on the tape to play in any order and the machine will fast forward or rewind them and play them in the chosen order. In addition, it has microphone inputs and a headphone jack with an adjustable output level. There is no output level control on the RCA line out jacks.



re: K-720

RonGinsberg, that is a very nice review of this great cassette deck and it brings back my fond memories of owning and using this deck a long time ago. I got mine in 1987, and I had it connected in a stereo rack that included the M-65 amplifier, C-65 control amplifier, T-85 tuner, CD-400 cd player, and NS-2000 speakers (a full Yamaha system). It was a lot of fun to sit right in front of the rack and use the K-720 and T-85 to record the FM radio and play store-bought tapes. The quality of the K-720 is really great: the looks and build quality, and when you press those high quality buttons/pads, you can hear and feel the powerful microprocessor-controlled mechanism react very quickly! It is a powerful and fast mechanism. The automatic silence fast forward is a nice feature, where the deck reacts very fast to skip over silence on the tape like at the beginning/end or between songs. Like the review says, the sound quality is very good, especially if you use the dbx recording and adjust levels to optimum. I spent a lot time using the deck and it was very fun to use it because of its quality and features. The sound quality was so good that I often just bought tapes at the record store rather than CDs to save some money, because on the K-720 tapes were just fine and easier to use at the time with car audio and portable stereos. Around 1995, after not using the deck as often, I tried to play a tape and something was wrong with it. So, I had it fully serviced and restored to perfect working order. After that, I even continued to buy some tapes in the 1990s just to play on it. Last time I played it was around 2001 to hear some old tapes from my youth. Now, the deck is in storage somewhere or maybe gone (not sure). Even though cassettes are considered obsolete by most people now, I still sometimes miss using this deck, because it was very good old hifi! I think it is a nice deck to get ahold of if you want to experience cassette tapes in a kind of mid-80s way and record the FM. :)

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