BA9/l0
BA9/11
BA9/HA
BA9/l2
BA9/l2A
BA9/l9, 20
BA9/2l
BA9/22
BA9/22A
BA9/22B
BA9/23
BA9/23A
BA9/24
- 51
BA9
Bay, Switching, Source B. Similar to
motor uniselectors are 9 level instead
available switching levels instead of
DD Spec 3.184. OBSOLESCENT.
BA9/7 except that
of 16 level (4
12). DD 1957/58.
Consists of Siemens equipment
selection by remote control of
ten destinations for basic
DD 1958. OBSOLESCENT.
providing facilities for
anyone of fifty sources to
sound and ancillaries.
Similar to BA9/ll but with rhodium plating on certain
level contacts. DD 1958. OBSOLESCENT.
Miscellaneous Routing Switching Bay.
providing facilities for selection by
anyone of one hundred sources to
providing through connection of one
OBSOLESCENT.
Siemens equipment
remote control of
12 destinations,
pair. DD 1958.
Similar to BA9/12 but with rhodium plating on certain
level contacts. DD 1958. OBSOLESCENT.
Bays of
selection
programme
channels.
programme
Extension.
Siemens equipment providing facilities for
by remote control of anyone of one hundred
routes to output of each of 12 Source/Route
Selection gives up to 12 wires (including 3
pairs). First used Broadcasting House
DD 1963. DD Spec 3.353. OBSOLESCENT.
Complete self-contained 200 line EMX for Regional Centres.
AEI construction to BBC circuit. 1.37m x 2.l3m high.
Suffix A indicates tag blocks at bottom for under-floor
ducts. DD 1963. DD Spec 3.359. OBSOLESCENT.
Basic unit
Accommodates
etc.
1. 37m
OBSOLESCENT.
of source selection switching system.
20 100 outlet source selectors with relays,
x 2.l3m high. DD 1963. DD Spec 3.360.
Identical circuit to
relays. Supersedes
OBSOLESCENT.
BA9/22
BA9/22.
better access to
DD Spec 3.423.
but with
DD 1965.
Similar circuit to BA9/22A but has 200 marking relays
instead of 100 for use with associated BA9/24. DD 1965.
DD Spec 3.423. OBSOLESCENT.
Used with BA9/22 for source selection at Regional Centres.
Accommodates 40 100 outlet source selectors. AEI
construction to BBC circuit, 1.37m x 2.l3m high. DD 1963.
DD Spec 3.361. OBSOLESCENT.
Identical circuit to
relays. Supersedes
OBSOLESCENT.
BA9/23
BA9/23.
but with better access to
DD 1965. DD Spec 3.424.
Ancillary
Regional
unit of source selection
Centres. Accommodates
switching system at
40 50 outlet source

51