The extremely efficient circuit, the 222-type tube, and good engineering makes the 644SG a four tube combination that ... The experimenter is referred to the 32- page free booklet aHow to Build the 635 Short Wave Set, a which shows severalanbsp;...
Title | : | Radio Manufacturers of the 1920s, Volume 3 |
Author | : | Alan Douglas |
Publisher | : | Sonoran Publishing - 1999-02-01 |
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