Jim Dunlop ECHOPLEX PREAMP EP101
Yes, it's called the Echoplex, but no, it's not a delay. For many years, a lot of the guitar you heard on the biggest recording was recorded through the Echoplex EP-3 just for the warmth it provided to the tone of the instrument.
To call this a boost is maybe a misnomer by what people think of as a boost. it provides 10dB of signal boost, yes, and that is by definition a doubling of volume (according to phsyics), but most boosts are 20db or above. This is more of a signal sweetener, the secret sauce studio trick to so many tones you've been trying to emulate for years and couldn't quite achieve.
If you're looking for a straight up clean boost, this isn't your pedal. But if you want the warmth and tone you've been craving for years, this might just be the perfect addition to your board.
What Jim Dunlop says: The Echoplex Preamp recreates the EP-3’s legendary preamp mojo, following the same signal path with FET circuitry and a Gain control for up to +11dB boost.
This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick™, Iso-Brick™, and Mini Iso-Brick™ power supplies (not included).
Echoplex Preamp players: BIllie Joe Armstrong (Greenday), Joe Satriani, Rob Chapman, Adrian Utley, Clay Gober, Richard Lloyd, Tyler Bates, Daniel Donato, George Vjestica, Joe Pisapia, Stephen Egerton, Kvelertak, Doug Martsch