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(!!!) (Recommended Pair) E288CC=8223 Siemens Germany 1974-1975 (34.2/34.4ma and 35.2/35.4ma) 1% matched

(!!!) (Recommended Pair) E288CC=8223 Siemens Germany 1974-1975 (34.2/34.4ma and 35.2/35.4ma) 1% matched

$ 199.99

1 pair) E288CC=8223 Siemens Germany NOS 1974-1975 same build

1 tube) 34.2/34.4ma Gm=21,400/21,600 (branded) Philips SQ 1975

1 tube) 35.2/35.4ma Gm=21,000/21,300 Siemens 1974

 

Good NOS Ma = 25-30ma

Good NOS Gm = 18,000

 

(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

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