BA9
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selectors for ancillary facilities for use with ordinary
source selectors. AEI construction to BBC circuit. 1.37m
x 2.13m high. DD 1965. DD Spec 3.362. OBSOLESCENT.
BA9/24A
Identical circuit to
relays. Supersedes
OBSOLESCENT.
BA9/24
BA9/24.
but with better access to
DD 1965. DD Spec 3.425.
BA9/25
Used at Bush House with BA2/9 and BA9/26.
2 FR/7, 3 PA17/120, RLP/39, RLP/19A, 2
DD Spec 3.371. OBSOLETE.
Type 9 bay with
CSM/2. DD 1963.
BA9/26
Used with BA9/25. Type 9 bay with AP/2, 7C/9. 4 MNA/3,
PA17/124, PA17/125, 2 PA17/123, 2 PA17/122, 2 PA17/121,
SDP/1, MDP/4, MU/51, 2 CSM/2. DD 1963. DD Spec 3.371.
OBSOLETE.
BA9/27
Modified BA9/5 used at integrated sound-and-te1evision
premises. DD 1963. DD Spec 3.368. OBSOLETE.
BA9/28
Modified
premises.
BA9/1 used
DD 1963.
at integrated
DD Spec 3.369.
sound-and-te1evision
OBSOLETE.
BA9/29
Continuity Studio Switching Bay. Part of EP10/13.
Comprises FW2/3A with PA9/5, PN3/2C, PS2/9, AM7/2, AM7/4A,
AM9/6A, PA17/129, PA17/130, PA17/131, FR/7. First used
Cardiff. DD 1964. DD Spec 3.397. OBSOLESCENT.
BA9/30
Continuity Cubicle Switching Bay. Part of EP10/13.
Comprises FW2/3A with PA9/5, PN3/2A, PN3/2B, PS2/9, AMS/4,
2 ME12/4, 3 AM7/2, 3 AM7/4A, AM9/6, JF/111, PA17/132,
PA17/133, PA17/134, FR/7. First used Cardiff. DD 1964.
DD Spec 3.397. OBSOLESCENT.
BA9/31
Control Position Switching Bay used with DK2/12 in EP10/13
to provide a control position when the continuity cubicle
is
not
manned.
Comprises
FW2/3A
with PA9/5, PN2/23A,
PN2/23B, PA2/9, AMS/4, 2 ME12/4, 2 AM7/2, 2 AM7/4A, 2
JF/111, PA17/135, PA17/136, PA17/137. First used Cardiff.
DD 1964. DD Spec 3.405. OBSOLESCENT.
BA9/32
Basic unit of a source selection system. Includes 20 50
outlet source selectors and associated equipment.
Standard AEI components and manufacture to BBC circuit.
2.13m high x 1.37m wide. First used Belfast. DD 1965.
DD Spec 3.406. OBSOLESCENT.
BA9/33
Standard unit with BA9/32. 40-50 outlet source selectors.
AEI manufacture to BBC circuit. 2.13m x 1.37m. First
used Belfast. DD 1965. DD Spec 3.407. OBSOLESCENT.
BA9/34
Selects from 200 sources and connects to up to 30
destinations, each source having available a music pair,
mu1tip1ed over all circuits, and a single wire for video
matrix switching/permanent indication, wired individually
for
each
circuit.
Compatible
with
BA9/22.
AEI
construction on 1.37m x 2.13m bay. First used Birmingham
Regional
Headquarters.
DD 1965.
DD Spec 3.419.

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