(!!) (Single) E288CC=8223 Siemens Halske Germany rebranded Telefunken NOS 1965 (41/29ma)

1 low noise tube) E288CC=8223 Siemens Halske Germany rebranded Telefunken NOS 1965

1 section) 41ma Gm=23,200
1 section) 29ma Gm=20,000

NOS Ma = 30ma

NOS Gm = 18,000

Tested on Amplitrex

(Specs: Vfil=6.3 Ifil=0.475A, Vplatemax=250V Pwattsmax=3.0)

Typical Operation:
Va   Vg1   Ia     Ra     Gm  Rk    Mu
100 -1.5 30.0 1,400 18.0 350 20-25