PI plates again..

[Tdale]

I'm going for a 10K trim between the PI plate resistors. Since some of you wrote that you sometimes use values as low as 90-something K for one of the plates I have a qustion.

Is the important thing that the two resistor values can be adjusted to be different?

Or are the actual values very important to? If so, using two 100K resistors and a pot, would give values that are over 100K for both plates, no matter how the pot is adjusted...

Tommy

[Bob-I]

I've found that the best sound I've gotten from the PI is using 110k and 91k, no trimmer. I don't find much difference tweaking the trimmer so I've stuck with fixed values.

But that's me. Dogears suggested 100K and a 20K trimmer.

[Tdale]

I have a 10K trimmer.. I think I'll try that...although I got Vishay/Dale 90.9K and 110K...

I got a precicion 10-turn pot, so I'll at least try it, to see how it works. It would be a shame not to use that beautiful pot

Also, I probably went a little crazy when I ordered the parts, but I got a 10-turn 100K pot for the OD entrance too... It's like some of the guys here said, it doesn' t really make sense to shop for certain resistors and cap, that are supposed to be the best, and then let the signal go through a tiny trim pot...

Tommy

[Funkalicousgroove]

I use 10 K and see a great difference on the scope from end to end. RE: trimmers-

Keep in mind that Piher and CTS trimmers are carbon comp, and alot of 10 turns are wirewound or CER_MET and that wll DEFINITELY affect your tone.

[Tdale]

What do you prefer....carbon or wire wound/cer_met?

Tommy

[Funkalicousgroove]

I like good old carbon comp, and from the amps i've seen so did Howie.

[Tdale]

Well, for the PI, the plate resistors are metal film, so the pot shouldn't wreck the sound that much I hope.

Tommy

[Funkalicousgroove]

I doubt it will have much if any effect, you'd probably be OK with or without the trimmer there, I've done it both ways.