Vol. 6, No. 5

Volume 6, Number 5

Volume 6, Number 5

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

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