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Description
1 matched pair) 12BZ7 RCA gray plates NOS 1964 and 1968
1 tube) 1.8/1.8ma Gm=3100/3100 (1968) (68-35)
1 tube) 1.8/1.9ma Gm=2800/3000 (1964) (AH)
Amplitrex Matched
Vplate=250V
Vgrid=-2V
Good Iplate = 2.0 - 2.5ma
Good Gm = 3000-3500
(Max ratings: 300Vplate, 1.5 watts)
(Vfil=12.6V @ 300ma)
(Typical Operation Class A amp: Vplate=250V, Vgrid=-2V, Ip=2.5ma, Rp=31.8Kohms, Gm=3200, Mu=100)
(The 12BZ7 has been subbed for a 12AX7 in some circuits)
(The 12BZ7 has 2 times the Gm (3200 versus 1600) and lower plate resistance (31K versus 62K) and higher filament current (300ma versus 150ma) than a 12AX7)
(The 12BZ7 was designed primarily for use as a sync separator and sync amplifier in television receivers. It is also useful in clipping circuits and as a general purpose audio amplifer)
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