princton tweed tone

[brian newman]

I finished a princeton tweed awhile back and I'm finding that the tone control doesn't change the tone enough.How does one increase the overall tone effect.Do I swap out the 250K pot or is it more complicated than that?

Brian

[Bruce / Mission Amps]

First thing to do is look at a schematic and your amp to see if you made a mistake and really did use a 250K tone pot...
A 1M audio tone pot, 500pF bright cap with a grounded .0047uF bass cap is the ticket.

[Mark Hammer]

The thing to keep in mind about the Princeton style of tone control is that it functions simultaneously as a treble cut and a sort of variable volume bypass cap. While the treble cut is independent of the volume pot setting, the bright function (treble boost) is not. As you turn the volume up, the treble enhancement aspect of the tone control will have less and less impact, and that will be almost completely independent of the value of the tone pot or cap. I've got a 59 myself, and I find that once my volume pot is up past 6 (and it goes to 12) the only thing I can realistically expect my tone control to do is cut treble.

That is not to discount Bruce's recommendation, but the helpfulness of that particular change will ultimately depend on what it is you want the tone control to do "more" of, and what sort of volume levels you typically play at.

[brian newman]

Bruce I did use a 250k pot,I checked it myself several times.I just felt the neeed for mord control.I used the schematics from Angela Instruments.I'm going to upgrade the drivers first to see what effect it has on the tone and then I will try your tweek

Thanks for the replies
Brian

[Bruce / Mission Amps]

Try what I said first.
The 250K pot is a mistake.

[brian newman]

Ok i try it first

Thanks Brian

[Mark Hammer]

Boy, I gotta read before I type.

The tone pot IS or rather SHOULD be 1M.

What I wrote still goes, but yes you will notice a much greater range of adjustment with a 1M tone pot.