Anyone Tried Russian Miniature Pentodes?

[Yorkie]

This seems pretty definitive but is way over my head: http://www.radiomuseum.org/forum/russian..._id=200277

- Joe

Thanks for that Joe - strewth, it went whoosh over my head too -looks like the basis for a PhD thesis! A bewildering assortment of types.

It certainly answers my initial query 'does anyone know about these little valves'? Given their very low price, I guess the surplus market must be awash with them. Nice 'pantry transmitter' potential, or funky little i-pod docking amplifier or what not? In the late 60s in Practical Wireless (when it was both 'practical' and about 'wireless' - not just an amateur radio mag), there was an article about converting NHS surplus 'Medresco' (Medical Research Company) miniature valve hearing aids, which used three tiny wire-ended valves. For a few years I used one that I adapted for use as a baby alarm - very sensitive.