20A, 20B As with the combination of these instruments shown on page 16, these cheapest of Bunnell's seperate instruments are rarely seen at antique radio, ham or railroad swap meets. They cost little when purchased, and had even less value to an experienced student who felt the need to progress to instruments more suited to his advanced status.
Even today, the Beeko instruments (and similiar ones by Knott and others) often command lower prices than many of better quality; sometimes quality means more to a collector than scarcity.
20B, 20C The key and sounder shown here are the mid-quality, cast-iron instruments. As noted on page 16, they were also available as a combination set. Collectors often call the lower quality combination sets "learner's sets," but the appellation is more properly restricted to the five-ohm sets of any quality; they are often used with a local battery and presumably by students sitting around a table. It is true, however, that a student was more likely to purchase the cheaper grade of instruments.
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