Rare vintage matched pair Ken-Rad 6SN7GT VT-231 Black Glass Valve/Vacuum Tube - AVO Tested very strong, likely NOS or low hours based on strength and condition.  One of the best war-time 6SN7's with extraordinary bass extension and overall cohesion.  

Tested on a recently calibrated AVO VCM 160 with the following results;       

                         IA      GM
Valve 1:   A1   13.2     2.7                
                A2    9.3     2.6
Valve 2:   A1    10.2    2.8                
                A2    10.1    2.8

AVO NOS Specs:  IA = 9.0 GM = 2.9   

No leaks or shorts / gas, solid bases, shiny pins. eBay seller for over 21 years, buy with confidence - see feedback.  Valves will be shipped next day, carefully packaged, tracked and insured.  Please drop a note with any questions.

Shipping happily combined on multiple items.

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Don't use your amp as a circuit breaker, buy tested valves!