RCA receiving tube manual. 

 - Harrison, N.J. :  RCA Corporation,  1970. 
 - Radio Corporation of America. Electronic Components. Technical series ;  RC-27 .
 - Radio Corporation of America. Electronic Components. Technical series ;  Radio Corporation of America. Electronic Components. Technical series ;  Radio Corporation of America. Electronic Components. Technical series ;  RC-27 .
<br/><br/>Bibliography: p. 672. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vacuum-tubes.