Probably just failed mechanically - they do seem to jam internally quite often.
VB
Yes, because baboons. 
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Yes, because NOT baboons 
Yeah. You baboon!!
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Stop it!
(It’s unfair to baboons)
Only seems to measure current draw, doesn’t measure mutual conductance (effectively gain)
While knowing current draw is handy for matching power valves it isn’t so helpful for small signal (pre-amp) valves.
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And another £1200 to ramp it up properly to 240v from 100…
My second pair of Supravox 165-2000 drivers are back, turned out they wanted to make a whole new batch due to mis-alignment between the voice coil and magnet.
Now very closely matched, and improved sensitivity.
Supravox 165-2000 (2-A) by Robert Seymour, on Flickr
Supravox 165-2000 (2-B) by Robert Seymour, on Flickr
Running them in with a mix of 20Hz sine wave and Orbital 
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Epic!
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Fantastic piece of work but where does one mount the reels ?
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Fucking hell, bigger than many phono stages 
Nice one, looks fab.
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Nice, but would look better in gunmetal 
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Nicely done. Is it complete?
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What’s the internal box made from?
Mu metal?