Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Guitars => Topic started by: crashtm1 on August 23, 2009, 10:03:42 pm

Title: How would you wire this?
Post by: crashtm1 on August 23, 2009, 10:03:42 pm

I've got a dual P-90 pickup guitar..  Also I've installed a piezo bridge..
 This is a custom build....
We already have a hole drilled for a Gibson 3 way toggle for the p-90s...
And we have 2 holes in the electronics cavity...

  I've been looking for a 500k push pull stack pot with no luck.. In down position I can have vol. for the mag pups and pull for piezo pup,,,, same with the tone pot..  Then maybe install a 2 mini toggles to activate either mag , piezo or both... I had considered a mini on/on/on switch,, but I dont believe that will work....

  Since I cant find the push pull,, I'm using the dual shaft, inside outside type... Inside shaft for mag,, outside for piezo..

  Any other ideas? 
  The body is already finished so we can't really add more pots...

Title: Re: How would you wire this?
Post by: jjasilli on August 24, 2009, 01:23:52 pm

Maybe have a master tone pot; and a dual vol pot with concentric controls; one part of the dual pot = master vol; the other section blends the mag & piezzo pickups.  Blending is not a bad option.

Title: Re: How would you wire this?
Post by: G._Hoffman on August 24, 2009, 02:30:16 pm

Those saddle piezos sound really unpleasant without a preamp, so the first thing I would do is get a preamp for it.  My favorite at the moment is the Bartolini one, which you can get from Allparts.  So that is my first advice.  After that, concentric pots are OK, but I usually wire them up with a mag volume, a mag tone, and a blend pot.  I also always use a jack that allows me to have a stereo output, and put a switch inside the control cavity so I can switch between stereo and mono. 

But I personally would never install a piezo bridge on an electric guitar without some kind of a preamp.


Gabriel

Title: Re: How would you wire this?
Post by: crashtm1 on September 01, 2009, 06:08:13 am

The next problem is the Lace Alumitone P90's...  These are thin... I have 500k pots and the std. capacitor... Can I make some changes here to fatten them up or just Yank 'em?

Title: Re: How would you wire this?
Post by: G._Hoffman on September 01, 2009, 04:18:57 pm

Quote from: crashtm1 on September 01, 2009, 06:08:13 am

The next problem is the Lace Alumitone P90's...  These are thin... I have 500k pots and the std. capacitor... Can I make some changes here to fatten them up or just Yank 'em?

I've never tried them, so I can say for sure.  You could try 250K pots, but I kind of doubt you will hear much of a difference.  That Bartolini preamp I suggested has two channels, so you could try that, but for the most part I am of the opinion that if you don't like something your best bet is to get rid of it and try something else.


Gabriel

Title: Re: How would you wire this?
Post by: Megachunk on September 05, 2009, 12:54:12 pm

Hey Crashtm1.

I work at Lace. The pickups are really a non-standard sounding pickup. There's more bandwidth with Alumitones, and they tend to give you a bit more of everything. EQ on the amp may need to be adjusted as well.

Those pickups need 250K pots. All the Alumitones use them. I'd try a .047 cap as well instead of a .022.

MikeG.
Megachunk