2. analog
  3. 142480-123939

How much are these tubes worth?

I recently acquired an HP Standing Wave Indicator and they had 2 tubes, but the prices vary from $16 to $130 from the sites I looked at. They are 2 ECC83/12AX7 with labels saying "Made in Western Germany" and "TELEFUNKEN". Any idea of how much these are worth would be much appreciated. 
baseben9
viridian's avatar
viridian
4,184 posts
 
How do they test? A Ferrari 328 with 200,000 miles on it is probably worth a bit less than one with 2000 miles on it. 
noromance's avatar
noromance
1,780 posts
 
Don't smudge the paint on the tubes!
viridian's avatar
viridian
4,184 posts
 
It’s interesting I live in Oregon and see a lot of Tektronics scopes and test gear. A lot of the dual triodes that come out of these pieces no longer show a match between the two triodes as they had differing loads on them.
jea48
2,944 posts
 
noromance1,619 posts01-04-2019 4:16pm

Don’t smudge the paint on the tubes!

+1

@ baseben9

Don’t even attempt to wipe them off. Keep your oily fingers off the white labeling.
Their value? You need to have them tested.

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tomcy6's avatar
tomcy6
1,368 posts
 
Telefunken 12AX7 that test new are probably worth $125 and up, depending on the cosmetic condition, how closely matched the triodes are (2 triodes per tube), how much over new they test, etc.  If they test below new, the price drops rapidly.
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