On Wed, 14 Nov 2007 11:05:10 +0000, Ian Thompson-Bell
wrote:

I often see volume control pots with their wiper connected directly to
the grid of the following tube. Trouble is as they wear they get a bit
scratchy and often lead to the grid becoming disconnected. Would you
agree it is good practice to add a resistor (say 1Meg) directly across
the grid?

Cheers

Ian

Yes, it is a good idea. Make the resistor about ten times the value of
the pot, or you will be changing the way the volume control reacts.

Disconnected grids are bad news.

d

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Pearce Consulting
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