Only used , not abused, domestically, ie not bumped around ina van at any
time.
Mechanically broken dome end of GT badged Sovtek 5881, neat circular crack.
Black deposit around a jet out of the envelope matching a black deposit on
the metal "protection" cage screwed to the cab back panel. Gripper function
around valve base was fine. Not obviously valve/cage touching, but close, I
will reposition this cage 1/4 inch lower down. Is this a recognised
design/construction failing perhaps Russian 5881 a bit longer than 6L6.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/