27 Jul
2007
27 Jul
'07
5:13 p.m.
6KB4 was the most common
type--a large, octal-based unit with a peculiar cup-shaped grid more
or less completely covering the cathode at the bottom of the tube and
about a 3/8" air gap between that and the long tubular anode (like
that on a 1B3, but much larger) connected to the top cap. Rated for
something like 20-30KV if memory serves and about 30W plate
dissipation.
It should be noted that 6BK4Cs still have a little value, as they are
used in, of all places, some older semiconductor fab machines.
--
Will