PS2
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supplies. Originally coded PA18/l. 1958. DD Spec 2.111.
OBSOLESCENT.
PS3/4
Used with PS2/l and PS2/2. CHl/3 chassis.
200V-250Va.c. 50Hz. (400 VA approximately).
240V d.c. at 1.OA isolated from earth.
DD Spec 2.116. ACO. OBSOLESCENT.
Input
Outputs:
1958.
PS3/4A
As PS3/4 but
altered to
200V-250V a.c.
d.c. at 0.8A
OBSOLESCENT.
tapping on mains transformer secondary
give increased output voltage. Input:
50Hz (480 VA approximately). Output: 300V
isolated from earth. 1958. DD Spec 2.116.
PS3/5
Provides 200mA at 24V d.c. for transistor amplifiers AM9/l
and ME12/l. l75mm x l14mm x l78mm. 1958. DD Spec 3.174.
WITHDRAWN.
PS3/6
Used in association with UN10/2 on PN3/3 to replace VFR/l.
Plug in chassis. Outputs: 3 at 280V d.c., 25mA and 1 at
6.3V a.c. up to lA. RX4. 1958. DD Spec 2.118. TI.L.2.
OBSOLESCENT.
PS3/7
Provides d.c. control current for MX8/50l via PA6/502.
CH1/3 plug in chassis. Output: 97V d.c. at 600mA. 1958.
DD Spec 8.28. DDHB 8.71. ACO. OBSOLESCENT.
PS3/8
Feeds either 2 or
Equipment. Outputs:
a.c. or 38mA at 285V
DD Spec 3.208. ACO.
3 amplifiers for Type B Studio
55mA at 285V d.c. and 2.0A at 6.3V
d.c. and 1.3A at 6.3V a.c. 1958.
OBSOLESCENT.
PS3/9
Feeds relays and pilot lamp circuits in mobile control
rooms. Output: l2V d.c. at 2.5A. 203mm x l2lmm x l78mm.
1958. DD Spec 3.215. OBSOLESCENT.
PS3/10
Used with C05/l on PN3/7 for Greenwich Time Signal System.
1958. DD Spec 2.121. OBSOLESCENT.
PS3/12
Basically similar to PS3/5 but modified for use on mobile
control rooms. 1958. DD Spec 3.214. OBSOLESCENT.
PS3/13
Used to supply AMI4/50l in CA2/50l for OT2/50l.
WITHDRAWN.
1958.
PS3/l4
First used at Holme Moss to provide 50V positive and
negative for signalling purposes on lines subject to
lightning stroke. 1959. WITHDRAWN.
PS3/16
Used to deliver l7V a.c. to a.c. windings of magnetic
amplifiers. Two outputs each giving 380mA maximum.
Suffix A indicates each output giving 500mA maximum. L4.
1959. ACO. OBSOLESCENT.
PS3/l7
Unearthed f50V power supplier with switching used for d.c.
signalling over unearthed lines. 483mm x l33mm panel with
two separate units similar to PS3/3 but unearthed, each
giving t50V at 250mA. Also accommodates UN9/4 or UN9/5 to

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