PA17/l00
PA17/l0l
PA17/l02
PA17/l03
PA17/l04
PA17/l0s
PA17/l0sA
PA17/l06
PA17/l07
PA17/l08
PA17/l09
PA17/110
PA17/lll,A
PA17/l12
PA17/113
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PA17
DD Spec 2.176. OBSOLESCENT.
Used at Plymouth. 1961. DD Spec 2.177. OBSOLESCENT.
Used at Meldrum. 1961. OBSOLESCENT.
Tone Selection Panel used on VF Switching System. Selects
first 12 of the 35 combinations. Similar to PA17/78.
1961. DD Spec 2.195. OBSOLESCENT.
Tone Selector Panel used on VF
second 12 of the 35
DD Spec 2.196. OBSOLESCENT.
Switching System.
combinations.
Selects
DD 1961.
Tone Selector Panel used on VF Switching System. Selects
last 11 of the 35 combinations. DD 1961. DD Spec 2.197.
OBSOLESCENT.
Signal Storage Relay Panel used on VF Switching System.
DD 1961. DD Spec 2.198. OBSOLESCENT.
Similar to PA17/l0s but only half equipped.
OBSOLESCENT.
1965.
used on VF Switching System
assist in ensuring that one
time. HM/lC. DD 1961.
Exclusive Circuit Relay Panel
between Bristol and London to
switching signal is sent at a
DD Spec 2.199. OBSOLESCENT.
Switchboard Response Relay Panel used on
Switching System. Repeats signals
switchboard in VF switching form.
DD Spec 2.200. OBSOLESCENT.
Bristol London VF
from operational
HM/lE. DD 1961.
Matrixing Relay Panel used on Bristol London VF Switching
System to interpret which of the 35 signals is being
received. Also indicates to Sending Terminal when
Receiving Terminal has operated override switches. HM/lE.
DD 1962. DD Spec 2.201. OBSOLESCENT.
For studio outside source telephone
Equipment). Two mounts on CHl/2l for
1962/63. DD Spec 3.330. OBSOLESCENT.
(Type C Studio
mounting in DK4/6.
Telephone Changeover Relays for Type C studio desk.
Mounts in CHl/2l. 1962/63. DD Spec 3.338. OBSOLESCENT.
EMX Telephone Relays for ringing and ring-receive
facilities for EMX control line from a Type C studio desk
in sound only premises. PA17/lllA has a buzzer cut relay
for use where a cubicle programme mic. is used. Mounts in
CHl/2l. 1962/63. DD Spec 3.339. OBSOLESCENT.
Source
sound
desk.
Signalling Relays used with single wire system in
only
premises.
Mounts in CHl/2l in Type C sutdio
1962/63. DD Spec 3.340. OBSOLESCENT.
Amp. C/O and Misc. Relays used on DK4/6 and DK4/6A.

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