This is the Collins Equipment Section of
The Broadcast Archive

Maintained by:
Barry Mishkind - The Eclectic Engineer
Last updated 8/8/06


Collins 21 Series - 5 and 10 kW Transmitters


The Collins 21A was produced beginning in 19xx


The Collins 21B/L was produced beginning in 1947


This 21B was the auxiliary at WSM for many years.

The 21L was the 10 kW version.



The Collins 21E/M developed a reputation as a workhorse transmitter. Many 21Es are still in use.


The 21E was contained in three cabinets.


KNST, Tucson shown

The 21M - the 10 kW version of the 21E had two PA tubes. Otherwise it was essentially the same transmitter.

Our thanks to Dave Hultsman for his recollections and help in gathering pictures and information.

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