"The heart of the Skronk remains true, the upgrades just help keep the blood pumping more efficiently": Blammo Electronics updates the mid-'60s Zonk Machine fuzz for modern usability with the Skronk Machine
The pedal maker promises that the Zonk's tonal character remains the same, although it has added a passive control dial, and made it a far more pedalboard-friendly unit overall
Source: guitarworld.com