A 1 kW Audio Amplifier.

Ceramic or Moulded Base Caps? Why choose Ceramic?.

Disc Sealed Valves. Also known as Planar valves and Lighthouse Valves .

The First All Valve Computer. The Colossus rebuild at Bletchley Park

Sealing of Glass to Other Materials. Taken from Vacuum Tubes by K Spangenberg (1948) ¹⁰⁰¹.

The GTY Suffix on Octal Valves. What the Y tells us.

Lighthouse Valves. Octal based disc seal valves.

The Mullard Receiving Valve Naming Convention. How to decode a receiving valve name

The Mullard Transmitting & Industrial Valve Naming Convention. How to decode a Mullard Industrial valve name

The Osram Miniature Valve Story. An extract from an Osram data book.

Pioneers of HT Rectifiers. A MOV speciality

Rectifiers for Pulse Modulators High voltage devices with low average current.

Series Pass Valves. Valves for voltage regulators.

Subminiature Valves. War & Peace

Television and Video Camera Tubes. How they work