"Don Pearce" wrote in message
...
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.

Yes. This was discussed some time ago on RAT. I think it was Sander
who raised the subject. He too recommended R to be 10 x the pot
value.

Iain