TranscriptionTurntable 12D/4

The Commonwealth Electronics 12D was the most popular turntable the company produced.

It was the last model the company produced and following the takeover by Philips the 12D stayed in production till the 1970's. Two versions were available, the three speed 12D/3 and four speed 12D/4. On both models the idler wheel between the motor and the inside edge of the platter uses a solenoid to engage the idler wheel while the power is on. Therefor a flat should not develop if the speed is changed while the power is off.

SPECIFICATION 12D/4:
Turntable diameter:       12in
Turntable weight:           6.5 lbs
Motor:                            4 pole, synchronous
Speeds:                         16.66, 33.33, 45.11, 77.93 RPM
Speed tolerance:           0% to +0.25%
Wow and flutter:             Less than 0.1% RMS total @ 33 RPM
Rumble:                         Better than -50db below recorded level of 7cm/sec at 1 kHz
Acceleration:                 1/2 rev @ 33.33 & 45 RPM, 3/4 rev @ 78 RPM

In questo link sono elencati 8 modelli, di cui 8 con immagini e 1 con schemi.
Elenco delle radio e altri apparecchi della Commonwealth Electronics Pty. Ltd.; Hobart, TAS