Perhaps I should add that the x-ray tubes manufactured at the (long gone) GEC Medical factory at Wembley were made under licence from
Machlett (a US company, of course).
These days, the site of what was the GEC Medical factory has become the usual mess (er, development) of warehouses, small industrial units, empty lots, car repair shops and so forth.
The once famous Hirst Research Centre (cavity magnetron, WWII radar
etc., etc.) was also located there. Hugo Hirst was one of co-founders (along with Gustav Byng) of the General Electric Company (GEC) in 1889; both were immigrants from Germany.
Lastly (for now, at least) for anyone really interested in current (as in "nowadays" ... as opposed to "Amps") High Voltage techniques, all you need to know (and more) is nicely presented in a download available on the
Spellman website (the 2024 High Voltage Reference Manual near bottom right).
For instance, see Section 4 starting page 41 for "Common X-Ray tube failure modes".
