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RE: Buyig Tubes

There are quite a few ways people get burned when buying tubes on fleabay (in addition to the obvious misrepresentation/bait and switch/etc.):

1- Really good fakes of NOS tubes - even if you have a lot of experience, it's hard to tell.
2- Marginal tubes sold as NOS, and matched tubes that are not so.
3- Tubes tested only for gm, but are noisy and microphonic. Many years ago I brought (not through fleabay) a bunch of 40's Sylvania VT-231's (6SN7's) for cheap. I didn't have any equipment then that uses that tube but now I do. Each tube still test better than NOS regarding mutual transconductance and looks perfect, but they noisy and microphonic as heck - things that consumer level tube testers cannot test for.


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  • RE: Buyig Tubes - Rocket_Powered 11:13:13 08/11/21 (2)
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