ECC83 mullard tube 12ax7 amperex philips quad valve s  red pip top

NAT LAB laboratory science department Made in Holland Ultra rare

8 TUBES = 8 VALVES = 8 VINTAGE VACUUM TUBES = 8 röhren = eight pieces

Red tipped laboratory selected
15mm Long Plate
Dark grey plate ribbed welded
O getter halo
plate with Silver tongues on rounded corners
copper rods
high quality tubes for preamplifier preamp per input phono driver stage first stage audio

ECC83 Double Triode  Audio Frequency High Gain
ECC83 = 12AX7 = B339 = 95-127-01 = 6L13 = CM1 = ECC83S
Similar Tubes  Normally replaceable-slightly different:   0AX7 ; 12AX7A ; CV492 ; E2164
Other class quality (otherwise equal):   7025 ; CV4004 ; E83CC ; M8137
Other characteristic (electr. data):   12AY7 ; 6N4_China
Other base and other heater:   6EU7 ; ECC808
Multiple differences or of other kind:   5751 ; 7729
Successor Tubes 1963   ECC808   5751WA
Base Noval B9A
Filament Heater Vf 12.6 Volts / If 0.15 Ampere / Indirect / Parallel / series AC/DC

fully tested 52/54 ; 48/42 ; 48/44 ; 40/44 ; 54/56 ; 50/50 ; 46/42 ( good at 32/32 ) on tube tester calibrated TV7D/U

box 69

code A