You know, I hate to be a naysayer, but I think if you want on-board reverb and an effects loop, you don't really want a Valve Jr. To me, the whole appeal of that amp is it's simplicity. I have a Valve Jr. and I could recommend it to anyone as a decent-sounding small tube amp at the price but they're definitely a bit chintzy and, in my opinion, not worth paying someone to mod.