Denon DP-55M Direct Drive Quartz Lock turntable & Hitachi HT-840

Posted over a month ago
Mississauga, ON L5E3H8(View Map)


For sale a high quality DENON DP-55M Direct Drive Quartz Lock turntable in excellent condition. Turntable works properly, no issues.

Price - $680

Also for sale a very rare and very high quality Lo-D (Hitachi) model HT-840 Quartz Lock direct drive turntable in excellent condition. Turntable operates at 33/45 speed and can operate in Quartz Lock mode or with regular mode where you can adjust speed with pitch control. Turntable operates properly and keeps the speed well.

Here is some more info which I found online:


Player system released by Roadie (Hitachi) in 1977. Roadie is not much for players Although it was not a major brand, taking advantage of superior basic technology such as the technology of possession of the motor I was putting out a real power aircraft. HT-840, among those, is the highest-class aircraft at that time, now it is much more than this value I had solid content and making it unlikely to be considered in the case.

Turntable part was sold even by itself TU-800, boasting Roydie boast "Uni Torque Motor" It carried it. "Uni Torque Motor" was a motor that required a perfect circular motion from the principle of motor rotation rather than increasing the number of stator slots to eliminate weak point cocking of the DC motor. We combine a donut shaped rotor magnet magnetized in 8 poles and 2 pairs of star shaped flat coils shifted by 22.5 degrees and the amount of torque generated from these two coils and magnets is always constant at any moment In principle it was a motor that does not cause cocking. Structurally, it has a thin flat shape with a simple structure of brushless, slotless, coreless, and had features such as durability, large starting torque and low temperature rise. It was a unique Hitachi motor with exceptional technology at the motor.

Uni Torque Motor Photo of TU-800 Lo-D HT-800 PHONO MOTOR UNIT ¥ 50,000

In TU - 800, uni - torque motor boasting excellent rotation accuracy is controlled by quartz lock (quartz lock PLL) Further improving load characteristics and rotation accuracy, realizing wow / flutter characteristic of 0.02% (WRMS). In addition, the turntable is made of aluminum die-casting with a diameter of 305 mm and also has an electronic brake mechanism that stops in 2 seconds It was installed.

The arm part is model AU-800 which is a static balance S shape which was also sold as a single body, and "Inner Absorber " method was adopted. In a normal tone arm, the main weight axis is made of rubber There was a method to shift the resonance frequency to the lower side by splicing and dumping, but with AU - 800, Dynamic absorber composed of weight and damper rubber absorbs resonance and resonance level There was a way to lower things. The head shell is fixed firmly by the chucking lock method A quiet and smooth movement oil dump type arm lifter was also installed.

Photos of AU-800 Lo-D AU-800 TONEARM UNIT ¥ 16,000

The cabinet has a two-layer structure of BMC (bulk molding compound) with high rigidity and excellent vibration damping characteristics and solid wood of high density particles, and by combining materials of high specific gravity and high rigidity of different kinds, We tried to improve the howling resistance. Also equipped with a large insulator with a height adjustment mechanism.

As mentioned above, the HT-840 was an analog player whose Roadie accumulated excellent basic technology and each part was boiled down in orthodox. Although it was not possible to obtain high popularity from the weakness of the brand power in the analog player, it was an easy-to-use and easy-to-use player.

Below is a part of the catalog of the time.

Accurate investigation of crystal lock, Quartz lock PLL servo mechanism adopted.

Heavyweight BMC Cabinet Comprehensive performance-oriented manual player

◎ Crystal control of uni-torque motor (Quartz rock PLL servo)) phono motor part, TU-800 ◎ Dynamic absorber method adopted Low resonance tone arm part, AU-800 ◎ Have sufficient consideration of howling resistance Two layer cabinet part adopted BMC material ● The turntable also stops in just 2 seconds Electronic brake system convenient for record exchange ● By crystal oscillation, one pattern of 331/3, 45 rpm One-pattern strobe system for displaying both ● Recycled butyl rubber used to suppress 'squeal' Turntable seat ● Suppresses backlash of the head shell, Chucking lock type adopted head shell connector ● Oil dump type arm lifter ● Trace the record sound groove reliably, Inside force canceller ● Large insulator with height adjustment mechanism ● Heavyweight dust cover

● HT-840 Specifications ●

■ Phono motor section ■ Drive system Quartz lock (crystal control) direct drive motor Flat type commutator DC servo (uni-torque motor) Turntable 306 mm φ aluminum die-casting Rated revolution 33 1/3, 45 rpm Speed ​​fine adjustment range ± 2.5% (when crystal control OFF) Wow · flutter 0.02% (WRMS) S / N ratio 77 dB (DIN - B) Load characteristic 0% (stylus pressure within 120 g) Rotational speed deviation Within 0.003% Starting characteristic Within 1/2 rotation Electronic brake Stop within 2 seconds

■ Tone arm part ■ format Static balance type tone arm with dynamic absorber Overall arm length 326 mm Arm effective length 240 mm Overhang 15 mm Tracking error 1 ° 50 ' Needle pressure adjustment range 0 to 3 g / 1 revolution (Direct read at 0.1 g step) Compliant cartridge weight 0 to 18 g

■ Cabinet section ■ Top board BMC board (thickness of plate 14 mm) Kibe High density particles, solid wood (thickness of 40 mm)

■ Comprehensive ■ Power consumption 8 W External dimensions 490 W × 180 H × 413 D mm weight 15 kg

Price - $900

Please check my other ads, I have many high end amplifiers, turntables, tonearms, headshells, cartridges and some other quality vintage electronics. Also have many parts for vintage Dual turntables (dust covers, spindles, weights, headshells, adapters...)

Vlad 416-831-1357

Please check my other ads for more high quality vintage electronics.

Vlad 416-831-1357

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