Pioneer MU-1800

1 9 7 5 may 1975
1 9 7 8 1978

Drive-only version of the PL-1800.

The motor, equivalent in both versions, was finalized and tested on july 30, 1975, by Mr J. Kukuchi for a Japan Audio Fair launch in october (for the PL-1800).
It is a 3-Hall elements brushless DC servo with a 280kg/cm2 inertial mass and 1kg/cm torque. Speed detection/correction is done with a printed circuit under the rotor and magnetically printed pulses, both compared by the servo and an AC feed.
The large power supply is current and temperature stabilized.

The strobe is located flat at the periphery of the platter : that's what makes it easily readable, that's what makes the platter reach for 34cm in diameter and that's what makes the 1800 beautiful, too, like a Sony TTS-3000 :)

The optional JP-C1800 enclosure, not that of the PL-1800, is made of three/four 2cm slabs of plywood and height-adjustable feet.
It also allows with more ease the use of a tonearm other than the 28,000¥ PA-1000.

Two samples visible here and here.

Pioneer MU-1800, image 1 Pioneer MU-1800, image 2 Pioneer MU-1800, image 3
Pioneer MU-1800 specifications
Title Value
Motor : Brushless DC with 3 Hall elements
Platter : Ø 34cm diecast aluminium
acrylic resin surround
Inertial mass : 280kg /cm2
Startup time : 1,5s (1/2 turn, 33 1/3rpm)
Wow & flutter : < 0,03% (WRMS)
Temperature drift : < 0,7% between 5°C and 35°C
Time drift : < 0,1% in 30 minutes
Speed switching : electronic
Pitch control : ± 6% (each speed independently)
S/N ratio : 63dB (JIS)
General General
Semiconductors : 3x Hall
42x transistors
19x diodes
PC : 5W
Dimensions : Ø 25,2cm x 12cm height (MU-1800)
13 x 8 x 6,8cm (control unit)
Weight : 13kg.
List price : 45,000¥ (MU-1800)
20,000¥ (JP-C1800)
Pioneer MU-1800 : 0 topic
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page online since : august 2011
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