374A Western Electric black plate used/good/65-70% 1960's:

1) 15.7ma Gm=2600 1964

1) 14.8ma Gm=2700 1965

1) 14ma Gm=2400 1963

1) 14.2ma Gm=2500 1967

1) 15.8ma Gm=2700 1967

1) 15ma Gm=2600 1967

1) 13.5ma Gm=2500 1967

1) 13.3ma Gm=2450 1967

1) 15.6ma Gm=2800 1967

1) 14.2ma Gm=2800 1967

1) 13.6ma Gm=2400 1967

1) 16ma Gm=2800 1967

1) 17.7ma Gm=2700 1967

1) 17.2ma Gm=3000 1967

1) 16.6ma Gm=2900 1968

MAKE TUBE SELECTION AT CHECKOUT

Tested on Amplitrex

Vplate=135V

Vscreen=135V

Vgrid=-18V

Good used/65% Ma range = 13-17ma

Good used/65% Gm range = 2400-2800

(374A specs: Vfil=3V @ 530ma, Vplate=135V, Iplate=18ma, Mu=210, Gm=3000, Rp=70K ohms, Pout=1.3 watts)