FourT6and2
Well-known member
I was looking at some auctions for NOS tubes. One such auction has the description: "Matched Pair NOS Siemens EL34 tubes." They appear to be from the '70s or '80s. So they're at least 30 years old. No other information about them, for example how they test. So I sent the seller a message:
ME:
What do the tubes measure? Are they tested?
HIM:
I do not know the numbers as these were tested years ago when I was doing
Dynaco Mark IVs and Marshal amps. They were NOS and matched so I did not
have a reason to store the numbers with them. NOS and matched, the numbers
are not needed.
ME:
I think the number are needed. If the tubes are "matched" but still test
well below spec or 100% of what a new tube should read, then that changes
things... If a new tube should read (for example) 80mA @ 450v on the plate,
and these read only 50mA, then they are bad tubes.
HIM:
They are brand new tubes.
ME:
Well unless you can tell me what they test at, I have no way of knowing
that. Isn't that's why most people selling tubes list how they test @ a specific
plate voltage? But all the best with your sale, thanks!
HIM:
You are the type of person that nothing will satisfy get a life.
ME:
What do the tubes measure? Are they tested?
HIM:
I do not know the numbers as these were tested years ago when I was doing
Dynaco Mark IVs and Marshal amps. They were NOS and matched so I did not
have a reason to store the numbers with them. NOS and matched, the numbers
are not needed.
ME:
I think the number are needed. If the tubes are "matched" but still test
well below spec or 100% of what a new tube should read, then that changes
things... If a new tube should read (for example) 80mA @ 450v on the plate,
and these read only 50mA, then they are bad tubes.
HIM:
They are brand new tubes.
ME:
Well unless you can tell me what they test at, I have no way of knowing
that. Isn't that's why most people selling tubes list how they test @ a specific
plate voltage? But all the best with your sale, thanks!
HIM:
You are the type of person that nothing will satisfy get a life.