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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.



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