If you're going to accuse any business of stealing from you, you need to be 100% sure and be able to prove it.
Why would a guitar shop steal medium-grade, used controls out of your bass? To sell to someone else? By the time you figure in the labor cost to do that, the profit would be pretty small. Guitar repair shops in any city have a relatively small potential customer base (compared to a WalMart or a Target), and their reputation among the guitar and bass-playing community in that city is the single most important thing that determines whether they survive or not. Stealing from customers is like playing Russian roulette with your business.
As a previous poster said, I'm continually amazed at the mean things that people will do to each other, but there seems to be little motive here for them to do you wrong, and a fairly big risk for them.
Something that no-one here has mentioned is the potential for a simple accident on their part. If you have a preamp running off a 9-volt battery, the output from the active electronics will sit at approximately 4.5 volts DC and the AC signal will ride on that. Normally there's an output capacitor there to block the DC and allow the AC signal through. If you're running a DC current through a typical carbon control, it will always be scratchy as you turn it. AC signals are not so much a problem. If the guitar shop opened up the control compartment, then maybe when they reassembled everything, the output wire got bent so that the output DC-blocking capacitor was bypassed and put DC out to the control. Or the capacitor itself could have shorted out internally, some types fail that way normally.
Or, as another poster mentioned, nut or fret-filing dust could have gotten into the controls. If that was the case, they should be willing to spray a little contact cleaner into the pots for you for free.
It is possible that they stole your preamp and controls of course but I'd be *real* sure of the facts and eliminate what may have been mistakes or accidents before barging in there and threatening or implying physical violence. And figure out which other guitar shop will work on your instruments in the future if you burn your bridges with this one.
Why would a guitar shop steal medium-grade, used controls out of your bass? To sell to someone else? By the time you figure in the labor cost to do that, the profit would be pretty small. Guitar repair shops in any city have a relatively small potential customer base (compared to a WalMart or a Target), and their reputation among the guitar and bass-playing community in that city is the single most important thing that determines whether they survive or not. Stealing from customers is like playing Russian roulette with your business.
As a previous poster said, I'm continually amazed at the mean things that people will do to each other, but there seems to be little motive here for them to do you wrong, and a fairly big risk for them.
Something that no-one here has mentioned is the potential for a simple accident on their part. If you have a preamp running off a 9-volt battery, the output from the active electronics will sit at approximately 4.5 volts DC and the AC signal will ride on that. Normally there's an output capacitor there to block the DC and allow the AC signal through. If you're running a DC current through a typical carbon control, it will always be scratchy as you turn it. AC signals are not so much a problem. If the guitar shop opened up the control compartment, then maybe when they reassembled everything, the output wire got bent so that the output DC-blocking capacitor was bypassed and put DC out to the control. Or the capacitor itself could have shorted out internally, some types fail that way normally.
Or, as another poster mentioned, nut or fret-filing dust could have gotten into the controls. If that was the case, they should be willing to spray a little contact cleaner into the pots for you for free.
It is possible that they stole your preamp and controls of course but I'd be *real* sure of the facts and eliminate what may have been mistakes or accidents before barging in there and threatening or implying physical violence. And figure out which other guitar shop will work on your instruments in the future if you burn your bridges with this one.