(!!!) (Recommended Pair) 12BZ7 National Union branded Admiral and Sylvania "U" getter NOS 1960-1961 era (1.6/1.6ma and 1.7/1.8ma)

1 low noise pair) 12BZ7 National Union black plates "U" getter NOS 1960-1961 same build - rebranded 1 tube) 1.6/1.6ma Gm=2700/2800 (Admiral) 1 tube) 1.7/1.8ma Gm=2800/2900 (Sylvania)     (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