Screen grit resistors

[tom_kinki3]

Stupid question, what are screen grit resistors?

Thanks guys,

Tom

[Steve Conner]

Unlike regular triode tubes (that have a plate, a grid and a cathode) power tubes tend to have an extra grid called the screen grid. It's charged with a high positive voltage, and designed to encourage the electrons to fly towards the plate and produce more power. But more often than not, they miss the plate and splatter back onto the screen grid. The screen resistor connects between the screen grid and the source of voltage, to stop it overheating if too many electrons happen to hit it.

[tom_kinki3]

Thanks alot mate, i have also now realised i spelt it wrong! Doh - but it was because i saw it spelt like that somwhere else!

Cheers again,

Tom

[Enzo]

And make sure never to get grit on your grid.