(!!!) (Recommended Pair) 12BZ7 RCA NOS 1964 and 1968 (1.8/1.8ma and 1.8/1.9ma)

1 matched pair) 12BZ7 RCA gray plates NOS 1964 and 19681 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) - Cary V12R amp- Cary PH-301 phono- Cary Rocket 88R- Audio Electronics Supply/Cary Six Pacs