18Watt.com

Isaac Stuckey wrote:one way I like to tame fizz is just to put a 47pf cap across the plates of the PI tube, it has worked for me many times on several amps.

Cheers!
This way?

Yea I've done it on several different amps. Actually never on an 18w based... but I never needed it there. The 1974x's always work for me, they are special.

Isaac Stuckey wrote:Yea I've done it on several different amps. Actually never on an 18w based... but I never needed it there. The 1974x's always work for me, they are special.

Cheers, I'll give it a try. What kind of cap should it be please? (Aye, I'm green as a leaf.. just assembled the PP18 few days ago)

A regular 47PF will work fine. I have used a 100PF too before I think, but I'm not sure. Either way, assuming I've only ever used 47PF, it has always gotten rid of some fizz/buzz and made it a little smoother. 100Pf will be more extreme, but not bad. Don't go too high otherwise you will get rid of all the highs, anyway, just experiment with it, and try it with more than one guitar, since you could use a tele and it has less treble and it sounds awesome, but it might not be as good with a les paul. Just experiment.

Just make sure the cap is of the appropriate voltage for the section.

One other thing that should also lessen treble a tad, and possibly add some more interactivity on the tone control, is to change out the 4.7nf (.0047uf) on the tone control for a .01. I like the .01 more than the .0047 in some other amps with that tone control.