pair tubes MH4 Marconi Mesh Plate big balloon globe shape , curved base , round plate , disc getter side , full flashed area ,

fully tested strong as per pictures data results of Metrix professional tube tester U61 , British made valves for Pre amplifier high quality , rare tubes in pair

MH4 = REN904 = E424N = E428 = NU41 = WE27 = TE24 = A4110  = RV4100 NOS genuine British Made year 1930's

MH4 has high gain vs the other similar tubes and the best choice for driver stage phono pre input

MH4 is an excellent driver for great output triode like RE604 , RS241 for Telefunken Siemens Klangfilm audio gear amplifiers and DIY project high end audio

box 77