This is a kit of 4x ECC83S and a pair of 5881 output valves. These are used in American amps for example Engl, one example being the Engl E330 Screamer.
All valves in this kit are from JJ Electronic in Slovakia. The 5881’s are a matched pair which have been tested by us and a test certificate for the output valves is supplied. One of the ECC83′ s is matched / balanced for use in the phase splitter position. This is selected by us and a test certificate is supplied with your kit.
JJ electronic offer good value for money and their valves are viewed as good reliable nice sounding work horses.