: What is the characteristic reverb effect on Fender amps? I hope I have this right but I'm fairly sure the classic Fender amps have some special reverb sound which is more 'aggressive' than a typical reverb. I've got a feeling

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Although I don't see many of them in use, Fender has made a separate spring reverb unit that usually stacked on top of an amplifier with a footswitch on the floor to engage or disengage the unit. It can be used to obtain the classic spring reverb effect without having to purchase another amplifier. I have one in my effects collection and it works very nicely.

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I'm not sure what you mean by the "aggressive"sound, but yes it's a thing, and it's called spring reverb.

It's essentially a couple of transducers, connected at either end of one or more metal springs. The input transducer converts your guitar's electrical signal to mechanical energy, which bounces around the springs. At the other end, the output transducer takes that mechanical energy, converts it back to an electrical signal and sends it on its way to be amplified. The springs vary in weight and/or length, so introduce slightly different amounts of delay, simulating the effect of soundwaves bouncing back at you from surfaces at different distances.

Spring reverb tanks don't make for practical stompboxes. A typical pedal isn't big enough to fit usefully large springs, and even if you made a big enough pedal it would have to be built like a nuclear bunker - it doesn't take much of a knock to send the springs crashing, which is not a sound you really want every time you step on a pedal.

I doubt there are many reverb pedals that don't have a "spring reverb" mode, but there are certainly pedals which do their best specifically to model vintage Fender reverb sounds.