Is the 6550 a beam pentode like the 6V6 and 6L6? That structure looks like beam forming plates.looks like the supressor grid is one big chunk of steel,
you can see that the screen has been worked hard, that grid wire thing next in line,
Is the 6550 a beam pentode like the 6V6 and 6L6? That structure looks like beam forming plates.
Interesting.
And the filament is likely thoriated tungsten. Do not lick.
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