9.2
Cassette Requirements
These are as follows:
1 Microphone Cassette for every 2 microphone channels and every two echo
return channels, up to a maximum of 12 cassettes frames should be made to
accommodate more if necessary.
1 Group Cassette for every 2 group channels with a maximum of 2 cassettes.
Each Group Cassette also provides 2 echo output channels so that it is possible
that the number of Group Cassettes is determined by the number of echo outputs
required.
1 Main Cassette for every 2 main outputs, up to 4 for 8-track working. An
extra cassette must be added to provide for auxiliary stereo working if this is
required.
1 Track Monitor Cassette for every 4 main tracks. An extra cassette is
required for auxiliary stereo.
1 Control Room Monitor Cassette.
1 Studio Playback Cassette.
9.3
Construction
Lateral rigidity is provided by the use of steel angle, welded to form a
rectangular member extending laterally substantially the full length of the frame and
vertically from the top of the visible part of the legs up to the meter box.
The forward portion, which houses the cassettes, is made of sheet aluminium
assembled with bolts so that it can be dismantled and packed substantially flat. The
frame for 24 cassettes consists of two sections each similar to that used in the
frame for 12 cassettes.
The legs are also made of sheet aluminium and can readily be unbolted for
transit. They are identical for the two sized of frame. The hand rest which extends
the full length is Formica faced wood supported on easily detachable brackets. The
end trim is also wood.
9.4
Cable Forms
Only two cable forms are used and these are completely separate from the
frame. There is no permanent wiring on the frame except the leads from the
microphones and meters, which terminate on plugs for insertion into the relevant
cassettes.
9.4.1 Main Cableform
