"West" wrote in message
news:TAS_i.21505$763.20213@trnddc07...

"Patrick Turner" wrote in message
...


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. From 0V or bias voltage to the grid.

AND better you replace the pot after cleaning it if that doesn't stop
the sratchiness.

Patrick Turner.

...AND better no pot at all, but if you must, use a step attenuator with
quality resistors.


Hi West.

Better still, no preamp at all:-) With the addition of a stepped
attenuator, one can feed the CD player straight to the power amp.
Morgan Jones states: "No preamplifier is better than any
preamplifier!" I agree with that sentiment.

Many take this a step further and add an input selector switch
as well as the SA to the power amp. This makes sense too.

Cordially,
Iain