UN1/542
UN1/546
UN1/548
UN1/549
UN1/549A
UN1/549B
UNl/550
UNl/551
UNl/552
UNl/553
UNl/554
UN1/555
UNl/556
355 -
UNl
Mains operated. Used
DD Spec 8.213. DDHB 8.218.
EPlL/ 508.
OBSOLESCENT.
DD 1963.
in
ACO.
Slaved Pulse Detector. Part of UNl/522 and UNl/528. In
absence of picture pulses from slaved sync separator it
open circuits on an indicator light circuit and operated
relay in the line discriminator to hold oscillator at
nominal frequency. Input is picture pulses from UNl/521
or
UNl/527.
CHl/12A.
DD 1964.
DD Spec 8.159.
ACO.
OBSOLESCENT.
Bias Unit used
DD Spec 4.19. ACO.
in MDl/502.
OBSOLESCENT.
CH1/l2A.
DD 1964.
Vidicon Tube Coil Unit
assembly in CMJ/502 in
OBSOLESCENT.
used as
EP6/501.
scan and focus coil
DD 1964. DD Spec 7.62.
Power and Sub carrier Processing Unit used in NTSC Colour
Coder GEl/521 to provide stabilised d.c. power and
processed ancillary signals for Chrominance Unit UN18/502.
Used for 625 line standard "I". CH1/12B. DD 1964. ACO.
OBSOLESCENT.
Similar to UN1/549 but for 625 line
DD 1964. DD Spec 8.184. DDHB 8.167. TI.
standard "G".
WITHDRAWN .
Similar to UN1/549 but for 525 line standard.
DD Spec 8.184. DDHB 8.167. TI. WITHDRAWN.
DD 1964.
Field Scan Unit for supplying field scan current to a 25mm
vidicon tube in EP6/50l. PN3/23 with PS2/23, 2 UNl/27,
AM1/534, GEl/5l9. DD 1964. DD Spec 7.91. OBSOLETE.
Line Scan Unit used in EP6/50l to provide 625 and 405 line
scanning currents for 25mm vidicon tube. PN3/23 with
GE1/514, AM1/524, AMl/52s, UN3M/s13, PS2/l3A, PS2/26.
DD 1964. DD Spec 7.84. OBSOLESCENT.
Relay Unit used in
CHl/13C. DD 1964.
MCCR/2 Television Mixer.
DD Spec 4.27. WITHDRAWN.
Modified
(Channels 1-5) used in EP7/s06 to
and vision outputs at intermediate
circuit
board.
DD 1964.
OBSOLESCENT.
Front End Unit, Band I
provide separate sound
frequency. Printed
DD Spec 12.1. DDHB 12.3.
Front End Unit,
separate sound
frequency.
OBSOLESCENT.
Band III used in EP7/50s
and vision outputs at
Printed circuit boards.
to provide
intermediate
DD 1964.
Vision and Sound AGC Unit used in EP7/s0s, EP7/506 to
generate AGC voltages from the output amplifiers to feed
back to the IF amplifiers. Printed circuit board.
DD 1964. DD Spec 12.1. DDHB 12.3. OBSOLESCENT.
Waveform Suppression Unit used as part of an AGC system in

55