The first widely published
CK722 project appeared in the February 1953 issue of the Radio and TV News
magazine. Shown on the left is a
scan of a section of the first page of this historic article – it shows the
front panel and side view of this first
CK722 radio project. The
radio was designed and constructed by Mr. Robert Dixon, who was an employee
of the Raytheon Receiving Tube Division at the time. A sidebar in the article noted that
CK722 transistors were recently available from Raytheon for $7.60 each
The middle photo on the left
is a rendition of a young experimenter enjoying his newly assembled
Lafayette KT-68 CK722 radio kit, which was sold in the 1956 T4-56 Lafayette
Radio catalogue for $11.80, including two CK722 transistors, in a high
performing regenerative circuit. The Lafayette Radio company was a well known
supplier of electronics to hobbyists in the 1950s and 1960s.
The bottom scan on the left is
an ad from the 1957 Federated Electronics catalog, offering a completed
transistorized radio kit for only $8.95.
This radio used two CK722 style transistors in a simple circuit with
few components. According to Mr.
Andrew Valentino, the creator of this radio, as many as 25,000 of these
units were sold.
Anniversary CK722 Radio
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