Technical manual
Subtitle: Sylvania set-tested radio tubes
By: compiled and published by Sylvania radio tube division, Hygrade Sylvania corporation, Emporium Penna
Publisher: Sylvania radio tube division; Hygrade Sylvania corporation
Published: 1937
Place of publication: Emporium, Pa
Language: eng
Number of pages: 183
Copyright date: 1937
Subjects: Vacuum-tubes; Radio
Notes: "Fourth edition."