Vintage Matched Pair GEC KT-66 Brown Base twin bottom getter Valve/Vacuum Tube - AVO Tested Very Strong.  Likely NOS -- ideal for guitars or hifi.  Quad II monos.

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

                         IA      GM

Valve 1:   A1   88.3    6.5    

Valve 2:   A1   86.7    6.3             

AVO NOS Specs:  IA = 65.0 GM = 6.3  

No leaks or shorts, 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.

For overseas purchases, please message for shipping quote before purchasing.

Don't use untested valves in your amp using it as a circuit breaker!