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If you google for the 6LF6, you'll find that not only do hams like it ("Fetch it out of one of those worthless 60's color TVs"!), but a certain sect of the audio fringe has a big thing for it, and of course, for those guys, only the 'correct sounding' tubes work. I guess on the bright side - if either sect decides they need new ones badly enough, Sovtek or such will make them...
Supposedly, they were in production into the 80's, and lots of TV sets used them. I suspect something else is at play here.
Ever price a 6BK4 in recent years? Tell me that makes sense too?
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