Spangenberg, Karl R. <br/><br/>
Vacuum tubes / 
Karl R. Spangenberg 
 - 1st ed. 
 - New York :  McGraw-Hill Book Co.,  c1948. 
 - xvii, 860 p. :  ill. ;  21 cm. 
 - McGraw-Hill electrical and electronic engineering series .
<br/><br/>Include index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vacuum-tubes.
<br/><br/><label>Dewey Class. No.: </label>621.384132  / SPV 1948