00437nam 2202600 45000010005000000030023000050050009000280080041000370820008000780720019000860200018001051000018001232600019001412450031001606500019001916500021002106500026002312600StarLibrary Marc Built20180420201711 ||||| |||||||||||amh  a621 aElectron Tubes a81-224-0071-x aN. N. Purkait bNEW AGE c1995 aFoundations of electronics aElectron Tubes aElectronEmission aIntroductory Concepts