The Mosferatwo by RhPf Electronics is a hand-built MOSFET overdrive and distortion pedal, made in Basel, Switzerland. The circuit design is original and isn’t trying to emulate anything familiar. In the short time I had the Mosferatwo to play around with and come up with riffs for a demo, I grew very fond of it. Maybe it’s because it’s an original circuit, but this pedal transforms into whatever its owner wants it to be naturally.
Drive and Level sit up top, with Focus centered below them, all on cream DAVIES 1900H knobs. Drive runs two gain stages off a single knob, so it covers a lot of ground on its own, while Focus shapes both the feel and the frequency response as you turn it. Below those, Heart and Bite are smaller knurled knobs, each paired with its own toggle: Heart’s toggle switches its tuned boost between 120Hz and 320Hz, and Bite’s toggle switches its boost between 1kHz and 5kHz. In the demo above I’ve set up sweeps for Drive, Focus, and both frequency modes on Heart and Bite, so you can hear exactly what each control and each frequency setting does on its own.
The gain range and EQ options are very broad and versatile. For me, this became an instantly perfect match for stoner rock tones and heavier riffage. I love cranking the Drive knob with Heart in the 320Hz mode to approximate those filthy, low-mid boosted tones I know from earlier Queens of the Stone Age records, and the Heavy Stuff preset (Drive at 8, Focus maxed, Heart and Bite both at 10) leans into exactly that territory. Crunching Stoner backs Drive off slightly with Focus and Heart both around the middle for a more rhythm-friendly grind. Stank Face Filter pushes Heart to 10 in the 320Hz mode with Bite pulled back, which thickens the low mids without getting muddy. Soft Distortion drops Heart out entirely and leans on Bite at 1kHz instead, landing somewhere between a boost and a distortion. The Mosferatwo adds a lot of character to your sound and worked especially well with my down-tuned guitar on this track (Drop D tuned down a whole step, so standard D plus Drop C, I guess).
The Drunk Beaver Kavun MOS Drive is another discrete MOSFET overdrive with a genuinely original circuit, so it’s a fair cross-shop. The Kavun leans on a passive three-band EQ (Bass, Mid, Treble) inspired by the Ibanez Mostortion, plus asymmetrical germanium and MOS clipping, for a texture that stays harmonically nuanced through moderate gain. The Mosferatwo takes a different route: instead of a broad tone stack, Heart and Bite give you two switchable, tuned frequency boosts that let you dial in a specific low-mid or presence bump rather than sculpting the whole voice. That makes the Mosferatwo feel more purpose-built for carving out a particular filthy, low-mid stoner tone, while the Kavun’s EQ is more of a general-purpose amp-like tool. Both reward spending real time with the controls instead of treating them like a single gain knob.
This is a strong pick for stoner rock, doom, and heavier riffage where you want low-mid weight without losing definition, especially with down-tuned guitars. The switchable Heart and Bite frequency centers make it easy to chase a specific tone rather than settling for a fixed EQ curve. If you want a transparent, low-gain boost or a pedal built around a familiar circuit lineage, this isn’t that pedal: the Mosferatwo is its own thing and it wants you to explore it. For players chasing filthy, low-mid boosted tones with real gain range on tap, it’s worth a serious look.
Get detailed specs on RhPf Electronics' website
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