The Western Electric 705A Speech Input Bay. Introduced in May of
1938, this bay assembly contained all the components required for
program control at transmitter locations. It was also the first offering
of popular 110A program amplifier in a preconfigured bay.
Considered by many to be the "Grandaddy of limiters",
the 110A was (in 1938) regarded as "the most significant innovation
in broadcasting within the past five years". Many broadcasters
claimed better than a 25% increase in coverage after installing the
The line-up of panels in the bay
(from top to bottom) were: repeating coil and equalizer panel,
7" blank mat, 110A program amplifier,
261B control panel, 751A volume indicator, 260A telephone panel,
jack panel, 106A amplifier (spare line amplifier), terminal panel,
another 7" blank panel with space for power switches, and the
94C monitoring amplifier.
The 705A speech input bay equipment
was housed in "an attractive
gray finished sturdy bay cabinet available with either stainless
steel or plain gray corner posts and trim."