Only one horn speaker was marketed in Canada with the Marconi name on it. The earliest ad found is dated Aug. 1925. It had a paper mache horn and appears to be identical to an American made horn. In 1926, cone speakers started to become popular. In the 1922 Marconi catalog, they were selling four horn speakers. One of them was the Magnavox, made in California.
It is possible to
drive a horn speaker with one detector tube, but only if receiving a very
strong local station. With headphones, you didn`t need an audio tube.
With an audio tube, one could hear stations further out. People
normally bought an amplifier to drive a speaker. The A.A.1 amplifier
could can provide more than enough volume for home use. The power
amplifier was for outdoors or for large rooms.
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| This was an ad for
a Marconi loudspeaker.
A three-way, control
balanced armature eliminates
Air Gap Adjustment is made to the armature by means of a vennier placed on the base. A laminated electromagnet intensifies the magnetic field. It employs an India Mica Diaphragm as used by the Victor, Sonora and Brunswick gramophones. The horn is mounted on a heavy, die-cast, assembly plate, which resists self-contained vibrations. The voice coil is designed and built to resist short circuits. List price $27.50. |