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Questions about tubes and gear that glows. FAQ

RE: I thought that the KT77 is a beam tetrode...

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

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