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Is life too short for QRP? OK, then build this linear power amp for the

70W Class AB Hi-Fi Amplifier

D.I.Y. Audio and Speakers

100 amplifiers – part 4 , 1959 – 82 | Amplificador de válvulas
170W Audio Power Amplifier Class D

5 + 5 W Amplifier (T057E)

100 Amplifiers – Part 3 , 1955 – 59 | Lilienthal Engineering