DENON DH-510

Commentary

This is a stereo tape deck that inherits the technology of the DH-710F/DH-610S and newly adopts a direct tension servo.

A direct drive capstan system is adopted for the mechanism.
The capstan motor uses an outer rotor type AC servo motor with low vibration and smooth rotation. In addition, the capstan motor uses a speed servo system with a high-precision recording detection method to ensure high performance.
The capstan diameter and accuracy (roundness) meet broadcasting station standards, and durability and reliability are ensured by applying a hard chromium treatment.

Equipped with a newly developed direct tension servo.
In this mechanism, the servo arm constantly detects gradual changes in back tension caused by changes in the feed radius on the feed reel side, uneven winding of the tape, and sudden changes in tape tension caused by eccentricity of the reel. The movement of the arm is transmitted directly to the brake band wound around the brake drum for approximately 1 1/4 (approximately 450 degrees) to keep the tape tension constant.
For example, when the tape tension is increased, the servo arm moves, the brake band is loosened, the brake pressure is reduced, and feedback acts to keep the tape tension constant. The backspring compensates for changes in the weight of the reel and tape, and changes in the friction coefficient between the brake drum and the brake band due to environmental conditions.
This mechanism has the same performance as an electronic tension servo, and we have developed and adopted new materials for brake shoes that are not affected by environmental conditions and aging.

The direct tension servo does not damage the tape because it is extremely fast from tension detection to response, the vibration generated by the motor is eliminated because voltage is not applied to the supply side reel motor, and the start-up characteristic of the tape is improved because impedance rollers are not required.

Equipped with brake servo.
This mechanism not only facilitates tape setting because the servo is activated when the tape is hooked on the roller of the servo arm, but also operates the back-tension servo during running or until the tape stops completely.
The servo effect can also be achieved while the power is turned off.

By installing a guide roller and scrape filter, minute vibration of the tape is efficiently suppressed, and sound quality with less modulation noise is obtained.

The drive mechanism, head, and amplifier are all mounted on a frame made of all-aluminum casting, improving machining accuracy and preventing the entire mechanism from getting out of order, greatly contributing to the improvement of overall characteristics.

By adopting a high hardness Permalloy type narrow gap head, the frequency characteristics are improved.
In addition, a special shape is adopted in order to reduce the shape effect that causes the expansion of the low frequency range.

The power supply for the amplifier section is a high voltage (35 v). In particular, in order to eliminate sound distortion and clip in the recording amplifier, the dynamic margin is provided with a sufficient margin like a professional model, and the margin is provided with more than 10 dB above the saturation level of the tape, which is more than 30 dB above the standard recording level.
In addition, the playback amplifier is a 3-stage direct connection type to improve the quality of the playback sound.

The microphone input consists of a microphone amplifier with a high dynamic margin of 55 dB relative to the reference recording input level and a microphone attenuator with a 12 dB attenuation.

The mixing circuit of the line and microphone contains the same mixing amplifier as the DH-710F/610S.

Using a continuously variable bias / equalizer, you can set the bias amount and recording equalizer characteristics to the optimum values according to the tape you are using.

The operation control part is a direct function using IC logic.
This allows you to move from any operation mode to the next mode without going through a stop. Inside the deck, it automatically checks that the tape has stopped completely before moving to the next operation, so tape safety is not affected.

Equipped with Rec mute/Pause mechanism.
If you want to create a white space between songs during recording, you can press and hold the Pause button to activate the Rec mute mechanism and create an unrecorded portion for any length of time, which is effective for editing the recording. After that, simply release the Pause button to return to the normal pause (recording standby).

An optical sensor type non-contact safety switch has been adopted for the winding side tension arm to improve reliability.

Timer recording and playback mechanism is installed.

Remote control is possible.

You can use headphones from low impedance type to high impedance type.

It can be used either horizontally or vertically.

Model Rating

Type	Tape deck
Track format	2-track 2-channel recording and playback
Heads	Recording and playing : hard permalloy heads Erasing : ferrite heads
Tape Speed	38cm/s, 19cm/s
Speed deviation	Within ± 0.5%
Motor used	For Capstan : 6 Pole Outer Rotor Type AC Servo Motor For Reel : 2 x 6 Pole Eddy Current Motors
Capstan drive system	Direct drive by AC servo motor
Tension servo system	Direct back tension servo
Wow flutter	38cm/s : 0.025% Wrms or less 19cm/s : 0.03% wrms or less
Reel Diameter Used	Maximum No. 10 (Type 26)
Quick winding time (with No. 10 reel, 740m tape)	Approximately 2 minutes and 30 seconds
Recording bias	Frequency : about 180 kHz Bias Amount : ± 40% Adjustable
Recording and playback compensation characteristic	NAB standard (recording guarantee can be adjusted depending on the tape used)
Overall SN ratio (hearing correction JISA)	66 dB or more for maximum recording level (514pWb/mm) 58 dB or more (for reference recording level (200pWb/mm))
Total Distortion Rate Characteristics (1 khz Reference Level)	Total harmonic distortion rate : 0.5% or less Third harmonic distortion factor (using Scotch #250) : 0.1% or less
Overall frequency characteristic	38cm/s : 30 Hz to 30 kHz ± 2 dB 19cm/s : 20 Hz to 25 kHz ± 2 dB
Channel Separation (1 kHz)	50 dB or more
Input (0 dB : 0.775 V)	Mic : 0.2 mV (-72dB, Att 0 dB) / 50k Ω unbalanced Line : 62 mV (-22dB) / 100k Ω unbalanced
Power (reference power level (0 VU))	Line : 0.775 V (0 dBm) / 100 Ω or less, Applicable load : 600 Ω or more Mic : 8 Ω or more compatible
Remote control terminal	Yes
Pwer	100 VAC, 50Hz/60Hz
Power consumption	80W
External dimensions	Width 455x Height 475x Depth 210 mm
Weight	22kg
Attachment	Reel 10 x1 No. 10 Reel Clamper x2 No. 7 Reel Clamper x2 Reel Height Adjustment Sheet x2 Two parallel pin cords Socket Wrench x1 for M3