3 Versions

See the scan below from the 1954 Allied/Knight catalog, courtesy Tom Bryant (thanks Tom!) It's another open chassis type, with three tubes, but the types are different, a 12AX7, a 50B5 and a 35W4. No transformer or iron core inductor, so we assume no speaker driving capability.

A look through the Allied Radio catalogs shows that Knight Kit stopped making this model in 1955 when the other open chassis unit introduced, followed by the closed chassis version.

There was also a "Phono Oscillator" designed to transmit a phonograph (only) to AM radio, which persisted for just a few years.

Knight Kit was officially launched in 1954.

Here are the two versions best documented. The first was known as the Wireless Broadcaster, and did just that.  The later, and most common version, was the Wireless Broadcaster And Amplifier, and made a speaker output available. 

They were built on three different chassis, the original (top of this page) and the second generation (below, left) being more of an "experimenters" type (and rather dangerous!) open chassis without a bottom cover.  As mentioned, the original 1954 version had no output transformer. The second generation (1955-1958) added the transformer, and the third version (1959 - 1965, tube layout was slightly different) added a bottom cover, but the same tubes were used in both designs; a single 12AX7 as an audio pre-amp, and two 50C5s, one used as an oscillator, one as a modulator.  The older design is on the left, new on the right below.  The Broadcaster was gone from the catalog by 1966.

Buy the complete manuals for both these types On-Line now!