Micro Seiki DD-100

October   1 9 7 6 october 1976
1 9 7 9 1979

Peak of Micro's direct-drive era, the DD-100 was attempted at becoming an export item but didn't.

As experienced by HiFi Exclusiv's team in 1978, the PLL electronics inside the power-supply did not take well the change of voltage from 100V to 240V : it just didn't work and speed remained erratically unstable.
So the 100 went back to Japan although, apparently, that one 1978 sample remained in Germany.

The DD-100 was not Micro's first direct-drive but the first to sport a very heavy and large platter : 5,2kg for a 40cm diameter of zinc alloy.

The motor is the same as that of the DDL-120 / DQL-120 or DDL-150, very likely to have been sourced from JVC, but it can here be switched for three speeds : the usual two plus 78rpm ! And the shaft rests on a teflon patch (ceramic would be for the DDL-120).
Also available separately as MD-100.

The very beefy external power-supply allows to pitch all three speeds up to ±6% individually and the PLL locking can be defeated ; its oscillator pulses at 35,1Khz.

The enclosure mixes three thick slabs of MDF plus two 3kg plates of lead ; the four feet are mainly big rubber dampers with a natural air chamber - they have to support 26kg.

The fixed tonearm is a MA-505L with a detachable magnesium headshell but a supplementary arm could be installed on the left side of the enclosure with one of five adaptors - even an SME 3012 can fit.

But the twist is not there : there are capacitance and resistance switches in the DD-100 ! Three settings each plus an individual bypass - long nights of sound-tailoring ahead !

A real DD-100 here.

Micro Seiki DD-100, image 1 Micro Seiki DD-100, image 2 Micro Seiki DD-100, image 3 Micro Seiki DD-100, image 4
Micro Seiki DD-100 specifications
Title Value
System : Direct-Drive
Motor : PLL Quartz-Locked DC Servo
Speeds : 33 1/3rpm
Pitch control : ± 6% (PLL off)
Wow & flutter : < 0,02% (WRMS)
Speed deviation : 0,002% (50ppm)
Load characteristics : 0% up to 150g (outer diameter)
S/N ratio : > 63dB (JIS)
Platter : zinc alloy, 5,2kg / 40cm Ø
Inertial mass : 1500kg /cm2
Type : dynamic balance
Effective length : 26,7cm
Tracking force : 0...3g
Overhang : 13mm
Offset angle : 18°45'
Tracking error : 0°20' (outer)
0°50' (inner)
Cartridge weight : 13...21g (incl. headshell)
19...27g (incl. headshell, with supplementary weight)
27...35g (incl. headshell, with supplementary optional weight)
pF settings : 100 / 200 / 300pF / direct (off)
kOhm settings : 22 / 33 / 68kOhm / direct (off)
General General
PC : 14,5W (MD-100)
Dimensions : 56,8 x 18 x 45cm (DD-100)
12 x 9,2 x 47cm (power-supply)
Weight : 26kg (DD-100)
5kg. (power-supply)
List price : 250,000¥
Side armbases (12,000¥)
A-3S Side armbases (12,000¥)
Audiocraft AC-400C
Denon DA-302
Denon DA-304
Grace G-565F
Grace 860F
Grace G-960
Audio Technica AT-1501II
A-3L Sony PUA-1600L
Stax UA-70
A-4S Ortofon RMG-309
Micro MA-505L
A-6L Victor UA-7082
SME 3012
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