diy IF transformers: first attempt.

[ppppenguin]

What's needed is a PNP valve!

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There may be something from the world of video signals processing that would be a help...

Many years ago I started to write an April Fool article for Wireless World based on the PNP valve. Never got finished. The physics is too hard to make even a plausible stab at it. Or maybe my imagination wasn't up to do a bit of sci-fi to get round the physics. Positrons or protons. Both are awkward. I was intending to publish under a nom-de-plume: "Anode Ray". To honour the great MG Scroggie who also wrote as "Cathode Ray".

To get good wideband amplifiers with valves was never easy. In 'scopes (especially Tektronix) the distributed amplifier was a complex and expensive (and hot!) way to get both gain and bandwidth. Invented, I think, by Percival at EMI in the 1930s. The White cathode follower helped to drive low impedance loads. Not sure if it was due to ELC White, another colleague of Blumlein at EMI in the 1930s.