Have a problem with radio on 1994 Chevrolet G Series Van (G20)

Radio was distorting so i installed a new radio and the problem exists i found a AccuMax-150 tv and radio head phone control could that be the problem it's a conversion van custom Mark lll do you know if there is an amp and where it would be located.

Asked by for the 1994 Chevrolet G Series Van (G20)
1 answer
There should not be a factory istalled amp in a 94 G van. However, what was done during the conversion or after is anyones guess.