Service valve equivalents.
Subtitle: [Co-authors: D. N. Corfield and A. A. Jones.
By: Editor: John Clarricoats]
Contributors: Corfield, David Nesbett.
Edition: 3d rev. ed.
Series: Its Amateur radio
Published: 1948
Place of publication: London
Language: eng
Number of pages: 28
Subjects: Vacuum tubes.