6sl7 tube nos Fivre Italy brown base
2x tubes matched pair , same emission for each tube
TV7 test results
tube 1 = 50/48 (reference good at 32/32) code 110
tube 2 = 50/48 (reference good at 32/32) code 110
both tubes identical inner structure, from the same lot , same factory code 110
brown base
fat plate
smooth plate
square getter bottom
full mica on top
with own carton box
with original military label on glass (selected tubes)
Old production 1950's
Made in Italy
original vintage vacuum tubes preamp
pre amplifier tubes
box 148