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A short technical note (4 pages in the online copy) containing several schematic diagrams for audio amplifiers built with germanium transistors — examples include low-power AF (audio-frequency) amplifiers (~4 W) and final-stage amplifier schematics. The material reads like magazine-style schematics or hobbyist notes rather than a formal textbook: it focuses on circuit diagrams, component arrangements and brief operational remark

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650: $a: audio amplifier circuits using germanium transistors (electronics)
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