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U47 with M7 cap VF14 tube (important to verify, as it has a large effect on price)
$7500 to $8000
U67 in good shape $4000 to $4500
U87 is about $1500 give or take a couple hundred.
KM84 in the neighborhood of $750 to $1000 each
451 about $300 each
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"I know that most men, including those at ease with problems of the greatest complexity, can seldom accept even the simplest and most obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have delighted in explaining to colleagues, which they have proudly taught to others, and which they have woven, thread by thread, into the fabric of their lives." Tolstoy
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