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↑ Norman H. Crowhurst, (1959) basic audio vol. 2, New York: John F. Rider Publisher Inc., pp.
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↑ Tapan, Sarkar, Mailloux, Oliner, Salazar-Palma, Sengupta (2006) History of Wireless. New Jersey: John Wiley & Sons Inc. pp. 108 - 109, 344.
1 2 Editors (Oct. 1927) "Screened Valves" Experimental Wireless & The Wireless Engineer pp. 585-586.
↑ Ballantine, Cobb (Mar. 1930) "Power Output Characteristics of the Pentode". Proc. IRE. p. 451.
↑ H. J. Reich (1944) Theory and Applications of Electron Tubes, 2nd ed.,. New York: McGraw-Hill Book Co. p. 56.
↑ Brown, L. (1999). Technical and Military Imperatives: A Radar History of World War 2.