Variable Message Repeater (VMR) MK 2

The Rola/Plessey Variable Message Repeater MK II is a compact magnetic drum recorder/reproducer designed to re-cycle a single message of up to three minutes duration with a minimum of "dead time " between cycles. It is a "multiple access" type - the message can be connected to a large number of callers simultaneously.

Specifications:
Frequency response:                 200 Hz to 3500 Hz within ± 4dB
Distortion:                                   Less than 3% at 1 KHz at reference output. Reference                                                         output equals 500mW into 6Ω load.
Signal to Noise Ratio:                 Better than 35db below reference output at 500mW.
Wow and Flutter:                        Less than 1 % rms.
Carriage return tone:                  50Hz, 0.2S seconds duration.
Tracks:                                        One track, 3 minutes duration maximum
Recording Medium:                    Ferro magnetic, impregnated neoprene band.
Inputs:                                        Balanced 600Ω line
                                                   Balanced 200Ω microphone
Output:                                       Balanced centre tapped line capable of delivering 500mW                                                     into a 6Ω load.
Record level control:                  Automatic preset.
Erasure of previous message:   Automatic during recording mode.
Start/Stop operation:                 Starts on earth signal from ancillary equipment. Stops on                                                       completion of  message.
Re-cycling time:                         0.5 to 6 seconds.

In questo link sono elencati 194 modelli, di cui 68 con immagini e 1 con schemi.
Elenco delle radio e altri apparecchi della Rola Company (AUS) Pty. Ltd.; Melbourne