AM18
AM18/503A
AM18/504
AM18/506
AM18/507
AM18/508
AM18/509
AM18/509A
AM18/509B
AM18/509C
AM18/509D
AM18/509E
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CH1/13E. Comprises AM3/50l. AM18/507. GE2/503.
UN1/5l0, UN3/503, UN9/5ll, UN9/5l2, PS2/l0.
DD Spec 8.60. DDHB 8.114. ACO. OBSOLESCENT.
GE2/504,
DD 1961.
Synchronising Pulse Stabilising Amplifier. Part of
625-line version of OB Mixer MX1/50l. Accepts outputs of
two cut/fade amplifiers AMl/504A or outputs of
split-screen effects unit UN4/50l and produces an output
signal with correct sync-pulses. CHl/l3E, containing
AM3/50l, AM18/520, AMl/558, GE2/503B, GE2/504, UN1/501A,
UN3/503, UN9/5llA, UN9/5l2A, PS2/57, NE1/5l4. DD 1968.
DD Spec 8.316. OBSOLESCENT.
Used with long transmission circuits to clamp the back
porch of a video signal and give output of lV p-p with
picture-sync ratio 70:30 into 75~. Normal line standards
and NTSC colour. Mains operated. PN3/23 with PS2/57.
GE2/6l3, AM3/50l, AM18/506. C04/502, UN13/50l, UN3/503.
DD 1961. DD Spec 6.103. DDHB 6.58. ACO. OBSOLESCENT.
Used for clamping and stabilising in AMl8/504. CHl/12A.
DD 1961. DD Spec 6.100. ACO. OBSOLESCENT.
Processing Amplifier used on AM18/503. Black level is
maintained at earth potential by AM3/50l. Incoming sync
pulses are removed by gates driven by GE2/S03 and new ones
added to output by GE2/504. CH1/12A. Transistors: 3
2G103.
6
OC17l.
DD 1961.
DD Spec 8.60.
ACO.
OBSOLESCENT.
Shunt Clamp. Part of AM18/509. Contains video circuitry
and supplies power to AM3/S0l and GE2/502. CH1/12B.
Mains operated. Suitable for any normal line standard.
Can supply up to 66mA at -lOV and SOmA at +12V for
auxiliary
units.
DD 1962.
DD Spec 6.86.
ACO.
OBSOLESCENT.
Shunt Clamp Amplifier used to clamp the back porch
potential of a video signal to earth. Comprises AM18/508.
GE2/502 and AM3/50l mounted on half of PN3/2l. DD 1962.
ACO. OBSOLESCENT.
Comprises two completely
of PN3/2l. DD 1962.
OBSOLESCENT.
separate clamps occupying whole
DD Spec 6.87.
DDHB 6.39.
As AMI8/509 but in flush mounting panel PN3/23. DD 1962.
DD Spec 6.87. DDHB 6.39. OBSOLESCENT.
As AM18/S09A but in flush mounting panel PN3/23. DD 1962.
DD Spec 6.87. DDHB 6.39. OBSOLESCENT.
Identical with AMl8/509C with addition of a lapped relay
changeover system to enable cuts to be made between
telecine machines operating in a duplex mode. DD 1962.
DD Spec 6.87. DDHB 6.39. OBSOLESCENT.
As AM18/509B with addition of UN3/507 and AMS/507.

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