Underground Accelerator


The Underground Accelerator is the successor to both Particle Accelerator and London Underground.

Neither were perfect, but both had strengths that the other didn’t so, Underground Accelerator takes the best of both into one glorious preamp. It follows the same general structure of the London Underground, letting it get a little more grit than Particle Accelerator, but still keeping the deep low end that London Underground lacked.

It sounds great as a clean boost or mild overdrive on guitar, but bass is where it really sings, providing the rich bottom end missing in so many bass pedals.

*The newest version of the UA has an EQ bypass switch. When the EQ is bypassed, the UA is equivalent to a Space Heater (which is why SH was archived)

Available on backorder

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Additional information


Bass, Gain, Master, Mids, Treble, EQ (toggle)

Enclosure Size


Footswitch Behavior



1x 12AX7




Center-negative, like most guitar pedals

Milliamp Draw

500mA @ 9vdc Warmup, 250mA @ 9vdc After Warmup