A stach of rare Philco-branded “export” tubes as recently found in Canada. See the story on page 2.
In this issue
- “Export” Tubes in Canada
- Those ABC Grades of Vacuum Tubes
- Bell Labs Control Tubes
- The CK703 Crystal Tubes
- Sparton Tubes
- 1931 De Forest Tube Kit
- The 6AJ5 Mystery
- The Tenth Anniversary of “Emission Labs”
- Weird Tube of the Month: The Last “Red Bank” Tubes
- Factory identifiers for “CV” Valves
- QRS Rectifiers
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