KPO Radio, San Francisco
Mixing A Remote Broadcast
Circa 1930s
The name of the engineer and the location is unknown, but this photo was probably
taken at 111 Sutter Street in the mid to late 1930s, judging from the equipment in use.
The "VU" meter has obviously been added to the microphone mixer, meaning it dates to
an earlier era. Also, the knobs below each fader are labeled "microphone current," indicating
they were designed to be used with carbon microphones, which required an external voltage source.
Carbon microphones ceased to be used in the mid 1930s when ribbon microphones such as the
RCA 44A (at left) became available.
The engineer is mixing a remote broadcast, as evidenced by the labels over the mixers, which
indicate "Mission Dolores," "Studio Announcer," and "Opera House."
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All articles copyright © 1997-2006 by John F. Schneider. All rights reserved.
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