Friends, throw away your bulk potentiometers - you don't need them anymore

[Pushtone]

OK Ha Ha, I like knobs on my boxes,
but I understand the concept of making a pedal sans pots.
Either with internal trimmers or fixed resistors.

Heres a great way to go bare on top of your pedals.
From Mission amps, this concept is just too cool and a great way to hide that "extra" control on a T-Lune.
http://www.missionamps.com/turbojax.shtml

Perhaps good for a bias trimmers too.

Dave

[birt]

i love the idea to do this with bias pots. you don't have to open the amp and you can accidentally adjust the bias like you would when the pot is on the outside.

[Processaurus]

Outstanding.

[Auke Haarsma]

great idea!

[GibsonGM]

 Pretty cool idea!  Seems like you could also hack the cylinder off of a Switchcraft type jack and use a nut on the inside & outside to do this a little less expensively...or get a small hollow threaded rod from the lamp section of the hardware store.

[earthtonesaudio]

I bet you could do it with open style jacks as well.  ...But I would put the pot behind an auxiliary output or something like that, so you could hear as you adjust the control.  Still, a very cool idea.

[eurekaiv]

Fit both the input and output jacks with one of these and you've got two accessible trimmers.  Neat!!

[ayayay!]

Outstanding idea.  But what kind of trimmers are they?  That radius and core lines up perfectly which could be the hard part.   

[any]

Outstanding idea.  But what kind of trimmers are they?  That radius and core lines up perfectly which could be the hard part.   

Really great idea!, never thought of that myself.The trimpots are from Piher, the 10mm upright model.
I've got quite a few of them... reasonably priced too.

[toneman]

TurboJax.... 

Very nice idea 

Thanx for the link   

[JFX09]

Call me stupid, but how are you going to bias a transistor if you can't hear it ? With a DMM ? But then you have to open it up, no ?

[John Lyons]

The PC mounted jack would be needed to align the trimmer to the jack's hole.
So unless you had another way to mount the board...you'd need the PC mounted jack.
The bias could be tested via small "Tip Jacks" that your meter probes fit in.
Either that or via a built in pedal bias meter a la Joe Gagan!!

Cool Idea none the less!

john