101D Western Electric Tennis Ball 1920's test like new (7.8ma and 8.4ma) (sold out)

$ 0.00

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