About the JHS Little Black Amp Box
If your amp has a “send/return” effects loop simply connect the input to your SEND and the output to your RETURN. You can use the LBAB to saturate your preamp section and get some cranked tube tone at bedroom levels!
Just a few popular amps with “send/return” effects loop are:
Fender Hot Rod Series
Fender Blues Deluxe
Peavey Classic Series