~3
AM3/507A
~3/507B
~3/508
~3/509
~3/510
AM3/512
- 16
present. Includes PS2/22B.
DD 1966. DD Spec 11.25.
OBSOLESCENT.
lines) colour burst is
CH1/12A, pegs 8, 26.
DDHB 11.31. DDHB 11.40. ACO.
As AM3/507
DDMI 11.25.
3.58MHz subcarrier. DD 1966.
DDHB 11.40. OBSOLESCENT.
but for a
DDHB 11.31.
As ~3/507 modified to operate with a hysteresis or
backlash of approximately 0.2dB. DD 1968. WITHDRAWN.
AGC Detector Amplifier used in EP7/511 and attached to the
output filter FL2/533A or FL2/534A. Consists of a probe
feeding a diode detector and an amplifier. DD 1967.
OBSOLESCENT.
Colour Burst Detector Amplifier for connection
625 line video circuit to produce an output
proportional to the colour burst level. Includes
CH1/12A, pegs 21, 44. DD 1968. WITHDRAWN.
across a
voltage
PS2/22B.
Amplifier, Detector, AGC used with EP6/505.
version of AM3/505 for use with colour signals.
DD 1969. ACO. WITHDRAWN.
Modified
CH1/12A.
AGC Amplifier Detector, 3 channel, for producing constant
amplitude RGB signals from a photo-multiplier system (e.g.
C03/502, C03/503). CH1/12A. DD 1971. WITHDRAWN.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
AM3 Sub Group not available for new designs DD 1977.
~4/1
AM4/2
AM4/3
~4/4
AM4 DISTRIBUTION AMPLIFIERS
Used in mobile control rooms. Two separate outputs each
with monitoring output. Plug in Chassis CH1/8. Z in:
10k~. Z out: 75~. W.V.G.: -4dB, OdB, +4dB. Transistors:
4 GET4, 4 GETS. DD 1959. DD Spec 3.211. OBSOLESCENT.
Used as line sending amplifier at battery operated
stations. Similar to C/9 but with transistors and printed
wiring. W.V.G.: 10dB fixed into 600~. Z in: 35k~. Z
out: 100~ built out to 600~ by separate network.
Transistors: 2 GET104, 2 GET105. DD 1959. DD Spec 3.243.
OBSOLESCENT.
Small plug in transistor amplifier 108mm x 73mm x 44mm
developed for use on conference circuit despatch position
in B.H. Extension. Up to eight mounted on PN3/13.
W.V.G.: about 50dB fixed, at zero level output. Z in and
Z out:
600~.
Transistors:
GET106,
2 GET104.
DD 1959.
DD Spec 3.248. OBSOLESCENT.
Used on UN3/501. DD 1960. DD Spec 8.79. WITHDRAWN.

16