AM22
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DD 1970. WITHDRAWN.
AM22 RESPONSE SELECTION AMPLIFIERS
AM22/l
Effects Response Selection Amplifier, used in Type-D
studio equipment to simulate telephone speech etc. Filter
characteristics similar to those in PEU/l. Comprises two
separate amplifiers. Insertion loss: OdB. Normal input:
-20dB.
CHl/37A.
DD 1966.
DD Spec 3.458.
ACO.
OBSOLESCENT.
AM22/3
Response Selection Amplifier, LP Filter, used in Type-D
studio equipment. Frequency response characteristic are
similar to those of the filter sections of AMl/9. Used in
tandem with AM22/2 to simplify desk-mounted facilities.
CHl/27A. DD 1967. DD Spec 3.470. ACO. OBSOLESCENT.
AM22/4
Response Selection Amplifier, Stereo. Has 2 circuits,
similar to AMl/4, with ganged controls. Chassis l78mm x
54mm x l52mm. DD 1967. DD Spec 3.454. OBSOLESCENT.
AM22/5
Response Selection Amplifier of commercial design.
Improved version of AMl/ll. Provides lift and cut at 9
selected frequencies:- 100Hz, 160Hz, 320Hz, 640Hz, 1280Hz,
2560Hz, 5120Hz, l0240Hz. Comprises control unit 254mm x
l02mm x 95mm deep plus amplifier unit, 229mm deep, which
can be remotely situated. Complete device can be 483mm x
l33mm panel mounted or portable in carrying case.
DD 1967. OBSOLESCENT.
AM22/6
Response Selection Amplifier with OdB gain, giving top and
bass tilt and lift and presence with ganged controls for
stereo. Has bypass key. First used BH Continuity.
CHl/37A. DD 1969. OBSOLESCENT.
AM23 MATRIX AMPLIFIERS
AM23/507
Camera Overlay Conversion Matrix Amplifier used with EMI
2001 colour camera to provide a B-Y output for colour
separation overlay. Mounts on the monitor card of the
C.C.U. and powered from the C.C.U. power suppliers.
Printed board 76mm x 38mm. DD 1970. DDMI 8.401. ACO.
OBSOLESCENT.

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