BBC MX/29 Outside Broadcast Mixer for OBA/9 Amplifier

BBC MX/29 passive mixer, 1952, for use with the OBA/9 outside broadcast amplifer. Four-channel unit with variable impendance balanced series faders. For each channel there are two input jacks; one for a ribbon microphone (connects straight to fader) and the other for a moving coil microphone (connects to fader using a 30/300 ohm transformer).

Part of a complete OBA/9 trolley (TRL/1) comprising 6 units, including cable. Note the serial numbers of the units - most of this rack comprises the units used in the original BBC service trial (two sets were used). OBA/9 units were still being used well into the late 1980s.

BBC SUP/6 Power Supply for OBA/9 Amplifier

BBC SUP/6 power supply for the OBA/9 outside broadcast amplifier.

Part of a complete OBA/9 trolley (TRL/1) comprising 6 units, including cable. Note the serial numbers of the units - most of this rack comprises the units used in the original BBC service trial (two sets were used). OBA/9 units were still being used well into the late 1980s.

BBC OBA/9 Outside Broadcast Amplifier

BBC OBA/9 outside broadcast microphone amplifier, 1952. This unit (using EF37A valves) gives up to 90db gain and also has a line-up oscillator and peak programme meter.

Part of a complete OBA/9 trolley (TRL/1) comprising 6 units, including cable. Note the serial numbers of the units - most of this rack comprises the units used in the original BBC service trial (two sets were used). OBA/9 units were still being used well into the late 1980s.

BBC OBA/9 Outside Broadcast Amplifier

BBC OBA/9 outside broadcast microphone amplifier, 1952. This unit (using EF37A valves) gives up to 90db gain and also has a line-up oscillator and peak programme meter.

Part of a complete OBA/9 trolley (TRL/1) comprising 6 units, including cable. Note the serial numbers of the units - most of this rack comprises the units used in the original BBC service trial (two sets were used). OBA/9 units were still being used well into the late 1980s.

BBC LSM/9 Loudspeaker Amplifier for OBA/9

BBC LSM/9 loudspeaker amplifier, 1952. For use in conjunction with the OBA/9 outside broadcast amplifier and associated equipment. LSM/9 is a 1 Watt loudspeaker amplifier used for monitoring and cueing.

Part of a complete OBA/9 trolley (TRL/1) comprising 6 units, including cable. Note the serial numbers of the units - most of this rack comprises the units used in the original BBC service trial (two sets were used). OBA/9 units were still being used well into the late 1980s.

BBC DU/1 Distribution Unit for OBA/9 Outside Broadcast Amplifier

BBC DU/1 distribution unit, 1952, for the OBA/9 outside broadcast amplifer and associated equipment. Part of a complete OBA/9 trolley (BBC designation TRL/1) comprising 6 units including cable.

Note the serial numbers of these units - most of this rack comprises the same units used in the original BBC service trial (two sets were used). OBA/9 units were still being used well into the late 1980s.

OBA/9 Trolley (TRL/1)

OBA/9 trolley (TRL/1). Holds six units of BBC television equipment. OBA/9 units were still being used well into the late 1980s.

Reel of Siemens Cable

A reel of Siemens cable, used with OBA/9 trolley (TRL/1) comprising six units, trolley and cable.