6as7ga Tube General Electric GE NOS NIB made in USA Old production

Vintage Vacuum tubes for HeadPhone Amplifier

tested strong & balanced  nos nib

test results

94/92 code 60-30 188-5 code DD getter
102/102 code 60-30 188-5 code DD getter
94/92 code 60-30 188-5 code DD getter
100/94 code O getter green lettering

( good at 36/36 ) on tube tester calibrated TV7D/U military instrument. One tube is not from the same serie, see pictures

6AS7GA
Similar tube  Other shape (e.g. bulb type):   6AS7G
Sub tube :   6AS7GYB
Other class quality (otherwise equal):   6080
Evolution 6AS7GYB  
SOcket    Octal  K8A
Industrial Vintage vacuum tube Valve
Filament heater    Vf 6.3 Volt / If 2.5 Ampere / Indirect
Amplification factor µ = 2.
Same characteristics as 6AS7G, with tubular T-12 bulb. Intended as series regulator in d-c power supplies

box 63