Peavey 5150
Fender Showmaster QBT
Digitech Digidelay
It's where you can place certain effects. They go after the pre-amp section of the amp, so they won't get coloured by your amp's distortion. It's good for reverb, chorus, delay etc. as you don't really want those effects to get distorted.
Hang on, you have a 5150 and a delay pedal yet u dont know what an effects loop is?!
Its the send and return jacks on your amp through which you put effects (such as delay). The reason behind this is so that you dont have to run them between your guitar and amp damaging your tone.
Fender Deluxe Strat HSS
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Fender Highway 1 Tele
Epiphone Les Paul Standard
Orange Rocker 30 Combo
Seymour Duncan Twin Tube Mayhem
Roland Microcube
Boss Micro BR
Korg Pitchblack
EHX Holy Grail
Hohner 3/4 Classical
Basically a guitar amp has two sections: a preamp and a power amp. The preamp puts the signal through one or more gain stages and provides a line level signal. The power amp powers that signal to a point where speakers can be driven. An effects loop is basically an insert between the two sections allowing you to further process the signal after the preamp but before the power amp.
ESP LTD EC-256 and a Fender Deluxe VM
alright, that's what i thought
Peavey 5150
Fender Showmaster QBT
Digitech Digidelay