here i have 8 bass knobs for sale,but i dont have the cables that go with them,i was told that its just a phone line,but im not for sure on that one.4 of them(2 in the middle and the 2 standing up) are from the old flame Memphis MOJO 2K but they work on other Memphis amps too.the other 4 are from random amps.i tried one of each on my AB 150.1 and they worked fine,so they should work for just about any amp,they seem to be universal.looking to get $10 plus shipping on each one.