[Roger Jones]

Hi, Vacuumlanders,
I just came across a very dead EL84/6BQ5 (from a P-P audio amplifier
with a leaky coupling cap to its g1 - take note!) Just for interest, I
cut the glass off just above the base with a Dremel-type cutting disk
(use glasses and gloves!) Then, I pulled off the plate assembly to
look at the electrodes.
The RCA tube manual calls this tube a "Beam Power Tube" but there are
NO beam plates, rather just a lose spiral grid 3. (Indeed, the word
tetrode is NOT used by RCA) But to me it looks like a power pentode.
Perhaps the rather open g3 spiral and supports may cause electron
beams, but it's not clear to me how this would happen.
Any comments on this and the name?
Cheers,
Roger