I just got a new catalog from Marconi Applied Technologies, the new
name for English Electric Valve. They have dropped the second
sourcing of Eimac-style 3CX, 3CW and 4CX, 4CWxxxx triodes and
tetrodes for broadcasting, but stayed with the industrial heating
versions of the tubes (low to medium mu triodes). Their website is
interesting, still referencing the word tetrodes.
http://www.marconitech.com/products/triode/indprod.html
They also make crowbar protection systems for high power high voltage
supplies. See the notes on their website, under thyratrons. They list
the crowbar units separately and have a simple schematic on their
data sheets.
John
K5PRO
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