(!!!) (Best Singles) 374A Western Electric black plate used/test like new 1960”s (21-25ma) (6 in stock)

374A Western Electric black plate used/test like new 1960”s with “”D”” getter halo:

1) 29ma Gm=3600 (1967)

1) 24ma Gm=3200 (1965)-

1) 23.2ma Gm=3100 (1966) –

1) 22.2ma Gm=3100 (1965) –

1) 23.8ma Gm=3400 (1969)-

1) 24ma Gm=3500 (1967)

0) 21ma Gm=3400 (1967)

0) 21ma Gm=3400 (1967)

0) 23.4ma Gm=3300 (1966)

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Tested on Amplitrex

Vplate=135V

Vscreen=135V

Vgrid=-18V

Good like new Ma range = 21-25ma

Good like new Gm range = 3000-3500

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