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AMI
AMl
MISCELLANEOUS AMPLIFIERS
AM1/l
Effects Amplifier. Continuously variable treble, bass cut
and boost and two steps of 'presence' boost. Gain: zero
for flat response, Z in and Z out;
600n.
Normal input
level: -20dB. CH1/8 chassis. Superseded by AM1/4.
DD 1961. DD Spec 3.306. DDHB
3.57. OBSOLETE.
AM1/2
Amplifier,
dB
Meter. Used on PA6/15 and PA6/16 in OT1/3
to feed an external
dB
meter. Plug-in printed wiring
card. Superseded by AMl/36. DD 1961.
OBSOLETE.
»11/3
Difference
operated.
Amplifier used
Portable.
DD 1961.
for measurements.
WITHDRAWN .
Mains
AM1/5
Tone Amplifier used as output amplifier in OSl/l.
CH1/18C. Output: OdB into
600n
with 1.8dB input level. Z
out:
<7n.
DD
1962.
DD Spec
3.385.
ACO. OBSOLESCENT.
AM1/6
Constant Volume Speech Amplifier for balancing
automatically speech levels over public telephone systems
prior to recording. Provides constant output level
of
-3dB
within t1dB for maximum variation of input levels of
40dB with bandwidth of about
280Hz to 3650Hz.
Switch
gives compression range of
40dB, 30dB, 20dB, 10dB.
Input
level not greater than OdB. Comprises
PN3/23
with
UN1/23,
UN1/24, AM6/1, FL2/2, AM4/6, UN9/7, PS2/49. DD 1963.
DD Spec 2.217. DDHB 2.143. TI. OBSOLESCENT.
AM1/6A
As AMl/6 but fitted with switch for
rA~/60. Supersedes AM1/6. DD 1968.
use with or without
WITHDRAWN.
AM1/7
Intercom Amplifier normally used with AM8/8 on PA8/197A.
Gain
is 50dB to 70dB
determined by external resistor.
Bass cut at the higher gain. 102mm x 25mm x 76mm plug-in
chassis.
DD 1963. DD Spec 3.395. ACO. OBSOLESCENT.
AMl/8
Motor Drive Amplifier used in EP5/501 to drive the iris
motor of the 16mm vidicon te1ecine projector. Provides
+llV to -llV d.c. for a 3W motor from a control voltage
of
-2.5V
to -12V d.c. Includes
PS2/22A. CHl/12A.
External
24V
supply from PS2/l3F normally. DD 1964. DD Spec
7.39.
DDHB 7.73. OBSOLETE.
AMl/9
Response Selection Amplifier used to modify the frequency
response
of a
channel. Includes narrow notch circuits to
eliminate hum, followed by a modified AMl/4 circuit,
switchable
LP
filters to eliminate TV whistles etc., and
an output amplifier. Mains operated. 483mm x l33mm panel
for
bay
mounting.
Supersedes
VCU/IA.
DD 1965.
DD Spec
3.418. DDHB 3.85. ACO. OBSOLESCENT.
AMl/9P
AMl/ll
As AMl/9
but mounted in
CS2/2B. DD 1966. OBSOLESCENT.
Response Selection Amplifier for shaping frequency
response
of
circuits. Provides frequency control per
octa~e. Modified commercial design. Portable.
DD 1965.
ACO. WITHDRAWN .
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