1x NOS 1957 3Mica BlackPlate TopD 5Star GE USA 5751 /LowerGain12AX7 /ECC83 E83CC
The high power 5751 are premium 12ax7 ecc83 w/ slightly less gain, introduced in 1949, as military spec and industrial grade. audiophile crown jewel '50s ge usa 5star edition! nice to fair silkscreen w/ etch code 'dots', and ge box included.