Tubes Asylum

Posted by Tre' (P) on March 15, 2023 at 09:54:43

In Reply to: RE: I thought that the KT77 is a beam tetrode... posted by Vinyl Valet on March 14, 2023 at 21:09:40

No, a true pentode (el34) has a cathode, control grid, screen grid, suppressor grid and a plate. No beam forming plate at all. Just a cathode a plate and three grids in between.

some people call a beam power tube a pentode because they consider the beam forming plate to be a fifth element.

A beam power tube does not function exactly like a power pentode but close enough that it can be a direct drop in replacement. 6ca7 for a el34 for instance.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 03/15/23