[JonnyD]

I have a 2013 fender vibro king. I recently picked this up and working on a few issues with it. A reverb issue which is fixed now but I have no bass control or very little.

It's a super bright amp anyway but even the bass control on 10 it's still bright. There's very little difference with the bass control knob off or full on.

Is there a way to test the bass control pot?

 

[Brett Pearson]

If you can get your voltmeter leads on the tabs of the pot, first check the outer two with the meter set to ohms and see if you get a reading. If you get no reading or overload then the pot is bad. If you do get a reading try one of the outer lugs and the middle lug and check the reading as you turn the pot...you should see the resistance go from 0 to whatever the value of the pot is...likely a 250k. Testing it in a circuit may give you different value readings as it is connected to other components but the values aren't important here, you just want to see that is shows a value of some sort and varies the resistance when turned. hope this helps. I have seen quite a few amps where the bass pot didn't seem to make much of a difference, try adjusting the treble pot and mid pot if you have one to different settings and then try the bass pot again to see if you hear more of a difference as some tone controls are reactive and will affect how the other tone controls sound.