My son and I jammed tonight on guitars and thought we might want to add vocals. We play old rock, Stones, blues, Allman Bros. type stuff. We use a '68Princeton R, and an Excelsior with Tele and LP or 335. My question is what microphone would work into a guitar amp? I have a Silvertone 1482 with a mic channel and we could plug into there. Thought we might get that John Mayall vocal sound. My budget would be in the $100-$150 dollar range and I buy used stuff from Guitar Center usually. Looking for something nice. I know nothing about mics and their cords, etc. I don't really want to get into a PA, as we play in my office and don't want to add a bunch more stuff to our setup. Thanks for your info.