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Sound Rating: 8 / 10 # Owners: 1
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Technical Details

Brand: Denon


Category:Super High Fidelity


Electronics:Solid State


Country of Manufacture:Japan

Release dates:1980 - 1985

Original Price: $1350

Tracks:1/2 Rec/PB

Speeds: 7 1/2, 15

Max Reel Size("): 10.5"

Number of heads: 3

Dimension: 455 x 475 x 210mm

Head Composition: Permalloy

Head Configuration: Stereo - Stacked

# Motors: 3

Auto Reverse?:No

Voltage(s): 110-120v, 220-240v

Outputs: RCA

Frequency Response:30Hz to 30kHz at 15ips 20Hz-25kHz at 7.5 ips

Wow and Flutter:0.045% at 15 ips, 0.055% at 7½ ips

Signal-to-Noise Ratio:playback 63 dB, record 59 dB

Sound quality rating:8 / 10

Long-term reliability rating: 8/ 10

Weight: 22 kg.

Additional Details


A two speed (7½ & 15 ips) half-track stereo recorder, solidly built. with a 10½ NAB reel capacity and an excellent tape-tensioning sytem. Features included three heads, three motors, separate bias and recording EQ adjustments for each channel and solenoid transport controls.

Newly developed direct tension servo
The servo arm detects changes in back tension on the supply reel. Uneven winding of the tape, or changes in tape tension caused by eccentricity of the reel. Movement of the arm is transmitted to the auto-adjust tension brake band wound around the brake drum to keep the tape tension constant.
When the tape tension increases, the servo arm moves and the brake band is loosened, adjusting brake pressure to keep the tape tension constant. The mechanism has the same performance as an electronic tension servo and uses a braking material that will not deteriorate with age.

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

The power supply for the amplifier section is 35 v, higher than most Japanese designs.
Dynamic range is similar to professional machines with more than 10 dB above the saturation level of the tape, which is more than 30 dB above the standard recording level.

IC logic with fast switching made this machine more suitable than most Japanese machines of the day for serious recording.

Additional Info

Year 1980
USA Price New  $1350, optional wired remote (RC-50) $85
Track System half-track stereo
Heads  (3)
Motors  (3) Capstan– AC servo 6 pole – Reels– Six pole Eddy Current 6 x 2
Maximum reel size  10½ ”
Tape speeds  15 and 7½ ips
Frequency Response 30Hz to 30kHz at 15ips –  20Hz-25kHz at 7.5 ips
Wow & flutter 0.045% at 15 ips, 0.055% at 7½ ips
Signal to noise ratio playback 63 dB, record 59 dB
Channel separation 63 dB
Rewind speed 87 seconds for 1800ft LP tape (7″)

DH-510 Review page 26 High-fidelity August 1981


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