The 6BZ6 is described as a semi-remote cut off pentode (Variable μ) for use in television receivers within the IF strip. Thus it was designed to provide wide-band amplification at 30 - 40 MHz.
This exhibit is an import to the UK and carries only the distributors name.
The construction is a central cathode with the two inner grids close by. The beam plate is approximately half way between the screen grid and the anode. The anode is effectively two plates joined by a thin strip.
A closer view showing that the grids pass flat across the cathode.
Turned slightly, the construction is easier to see. The pitch of the control grid is smaller at the two ends.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 46 mm tall.
Reference: Data-sheet. Type 6BZ6 was first introduced in 1955. See also1955 adverts.