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RE: Made to last, days gone by!
We call them valves, and funny you say that, I pulled two old kt66's out the cupboard the other day, they cost pennies years ago, and after looking on evilbay they now sell for way over $100 each, happy days if ever I decide to sell them, good old GEC.
I guess I should have been saving tubes, they never cost much to replace, that's why they had tube testing machines in a lot of grocery stores here in the states. Less than a buck for most of them. I think they have gone up percentage wise more than the price of gold or silver.
Indeed they have, I just had a look on evilbay and $300 each is not out of place for a kt66.