101D Western Electric Tennis Ball 1920's test like new (7.8ma and 8.4ma) (sold out)
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0 matched pair) 101D Western Electric Tennis Ball 1920's test like new in white boxes, test very strong and zero gas
0 tube) 7.8ma Gm=1000
0 tube) 8.4ma Gm=1000
(AF Voltage Amplifier)
Vfil=4.5V @ 1A
Vplate= 130V
Vgrid= -9V
NOS Iplate= 7.4ma
NOS Gm=1000
mu=6.2
Rp=5800 ohms
Introduced in 1921
See more: vacuum tube