Vox amPhones & amPlugs.
I first bought the Vox "Joe Satriani" model of the amPlug. The headphone jack got loose from pulling the headphones in & out all the time...you know those old holes eh, they get loose. It still works, but I have to put the plug in half way in a specific spot. I decided to buy the Vox amPhones, which is really the same thing built into headphones. They're great for practicing at the wee hours of the night...nobody can hear you, so you don't bother anyone. I'd suggest just leaving a good set of headphones plugged into the amPlugs so the hole don't get too loose like mine. I suppose I could buy a new jack and solder it in, but where would I get a headphone jack like that? There are various models too e.g. Lead, Bass, Classic Rock, etc. They're nice to have for sure.