I have been holding on to these for about 15 years. I just can't justify using them in one my guitar amps so they should go to someone who can take advantage of what they are.

These are very rare "Selected" medical grade 12AX7s from Telefunken. These are NOS tubes. Since there is no option to select NOS and because the boxes are not complete/ perfect they are marked as Used Mint in the condition. 

The red painted tips, and other "selected" marking indicate they passed noise testing for critical use in hospital or aerospace test equipment.

Two of the boxes are original stamped with "Selected" and 2 are plain white boxes. See pics for markings and note that the small cloth tape label has been left for originality on tube #7, but you may want to remove it and clean off any residue before use.

The tubes have all been tested on a B&K 747 with the following mutual conductance numbers

Tube # Triode 1 Triode 2 
1    79   82
2    82   83
7    80   82
8    80   79

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Listed2 years ago
ConditionMint (Used)
Mint items are in essentially new original condition but have been opened or played.Learn more
Brand
Model
  • 12AX7 Selected (Qty. 4)
Categories
Made In
  • Germany

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Java Amps

Loveland, CO, United States
Sales:148
Joined Reverb:2015

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