The Drawing numbers of the block schematics of the six types of cassette are:
Microphone Cassette
DE2
Group Cassette
DE3
Main Cassette
DE4
Track Monitor Cassette
DE5
Control Room Monitor Cassette
DE6
Studio Playback Cassette
DE7
Main Power supply unit
CE8
2.3
Mechanical Components
2.3.1 Cassettes
There are six types of cassettes, which are of uniform size.
These are as follows:
Microphone Cassette described in section 3.
Group Cassette described in section 4.
Main Cassette described in section 5.
Track Monitor Cassette described in section 6
Control Room Monitor Cassette described in section 7.
Studio Playback Cassette described in section 8.
2.3.2 Frame
Two sizes of frame are available and are described in section 9.
The larger frame holds up to 24 cassettes and the smaller frame holds up to 12
cassettes. Blank panels may be fitted if cassettes do not occupy all the channels
available. Blank cassettes are available having plugs to accommodate the unused
sockets on the cableform.
2.3.3 Main Power Unit
This is entirely separate from the frame and is preferably located some
distance therefrom. If the tape machines are in a separate machine room, the Main
Power unit could be in the same room.
The Main Power Unit is described in section 10.
2.4
Electrical Components and Features
2.4.1 Active Units
Each cassette contains a multiplicity of active units, each of which is
designed to perform a specific function. This enables the internal signal level in the
Mixer to be kept substantially constant, thereby making possible an extremely good
signal to noise ratio and very low power consumption. Many of the active units are
used in more than one type of cassette thereby simplifying manufacture and the
maintenance of a stock of spare components.
These active units are described in Section 12.
