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Ralph Mowery

In article ,
says...
Tubes are a whole 'nuther thing. It looks like there is a lot to
learn about tubes. How specific types work, which can be substituted
for which, etc. Which are best in new production because NOS tubes may
not be any good. And are often more expensive anyway.
Any more advice and suggestions are welcome.

Most NOS tubes I have dealt with seem to be fine. I have some tubes
that are very old and no problem with them. Many can be bought for a
few dollars if you look around.
I have a ham amplifier that has the origional tubes in it from aound
1975 or older. They still put out the rated power.