GEC KT-77 Pair

GEC KT-77 Pair tested with Amplitrex AT1000 as NIB/NOS

GEC KT77 Quad (EL34 Equivalent)

The GEC KT77 is considered by most to be the ultimate EL34. It is an incredibly rare tube, due partially to demand, but also because GEC was the only manufacturer of KT77s. All 4 tubes are matched, new, and including all original packaging including the test sheets from the factory. 

All tubes are tested on a AT1000 computerized tube tester at real world operating voltages (400 volts in the case of the KT77), one tested tubes are also matched at those voltages. For power tubes we match based on EM first and then GM. For small signal tubes we match based on GM then EM. 

Please be aware that vintage vacuum tubes are antiques and carry no guarantee or warranty. We provide a sheet explaining what you purchased, your test results for your tubes, and if need be can provide photographs of the tube on the tube tester before we pack and ship them.