On the Cover
This appears to be British Post Office “Valve Amplifing No. 1,” made by BTH, as discussed in Keith Thrower’s British Radio Valves – The Vintage Years; 1904-1925. The photo is of a sample in the long-abolished tube museum at Bell Laboratories. Photo: Bell Labs, courtesy of Jerry Vanicek.
In this issue
- The Strange World of Memory Tubes
- More on the Selectron
- British Valve Nomenclature: Ferranti
- Orphan Tube Meets Discarded Power Supply – Regeneration Occurs
- More on the Long- Ignored Compactron