The VFE Alpha Dog is a vintage distortion pedal from VFE Pedals built on the ProCo Rat circuit. VFE describes it as combining "the warmth and sag of tube saturation with the teeth of a modern distortion pedal," and says its HARD and SOFT controls provide "an infinite continuum of voicings, from bluesy breakup, to aggressive grunge, to stoner rock"1. What sets it apart from a standard Rat is that it gives you soft and hard clipping on separate knobs, plus a Fat control for the low end.
A Rat-based distortion with soft and hard clipping
The Alpha Dog is, in the maker's own words, "the VFE take on the ProCo Rat"2. The Rat itself is an op-amp-based distortion circuit combined with diode clipping3, and its trademark hard clipping comes from a pair of silicon diodes, which MusicRadar's reviewers describe as yielding "an aggressive yet smooth distortion"4. GuitarPlayer's Dave Hunter notes the Rat's bright, heavy distortion is the product of op-amp clipping, "allegedly made even heavier than intended by an errant resistor choice during prototyping that pushed the op amp harder"5.
Where the original Rat gives you one fixed clipping arrangement, the Alpha Dog splits it into two controls. The HARD control transitions from vintage (V) to twin (T) clipping, and a separate SOFT control shapes the softer side of the distortion1. VFE's manual describes its variable HCC circuitry as letting you "fine tune the harmonics, compression, and clipping character of your tone"2. For context on how the Rat smooths its own clipping, a technical analysis of the Rat 2 circuit notes that a small capacitor in the gain stage acts as a lowpass that cuts high end and softens the clipping character6.
Controls
The pedal carries six controls, as listed in a 2024 GuitarPedalX roundup of compact Rat-style distortions7:
| Control | What it does |
|---|---|
| Level | Output volume; a passive attenuator that tames the large signal inside the pedal2 |
| Fat | Affects low end response8 |
| Gain | Distortion amount |
| Hard Clipping | Transitions from vintage (V) to twin (T) clipping1 |
| Filter | Tone filtering |
| Soft Clipping | Shapes the softer clipping character |
The Fat control is notable because a standard Rat has no dedicated bass control. VFE references it elsewhere in its range too: the Dragon Hound's manual describes one of its knobs as being "like having the FAT control from the Alpha Dog & the LOW control from the Pale Horse in one knob"8.
Power and build
The Alpha Dog accepts an industry standard 9 to 18 VDC, negative-tip power supply1, so it runs on a common pedalboard supply and can take higher voltage for more headroom. Internally it is a single supply design, which in the DIY documentation means the voltage inverter and its associated components are omitted from the switch board2. The project PCB measures 2.17" x 2.025"2. The DIY files record two updates: a July 31, 2017 update that replaced W1M [C] taper pots with regular 1MB pots in the parts list, and an 11.13.17 update that removed two 470k resistors from the bill of materials that were not in the build2.
Price and what reviewers said
VFE lists the Alpha Dog at $179.00 regular price, with a $129.00 sale price on its product page as of October 20261. A 2024 GuitarPedalX buying guide listed it at $199 / £1497.
"This has long been a favourite Rat of mine with its superb mix of Soft and Hard Clipping and extra Fat control"
That review placed the Alpha Dog among the writer's favorite compact Rat-style distortions, with the mix of soft and hard clipping and the Fat control called out as its strengths7.
Warranty and returns
VFE offers a 30-day return period: "Try any VFE Pedal risk-free for 30 days. Return it in new condition within the first 30 days for any reason and get a full refund!" All pedals assembled by VFE also carry a 1-year warranty on parts and labor1.
Videos
VFE Pedals
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Mike Hermans
Questions
What circuit is the VFE Alpha Dog based on?
The Alpha Dog is VFE's take on the ProCo Rat. Like the Rat, it is an op-amp-based distortion circuit with diode clipping, built around the LM308N chip. VFE expanded on the original with its HCC circuitry and separate soft and hard clipping controls.
Is the VFE Alpha Dog discontinued?
The DIY project files describe the Alpha Dog as part of a recently discontinued line of VFE pedals, with PCBs provided for DIY builders only. VFE also states it will close down at the end of 2026 while continuing repair service for out-of-warranty products indefinitely.
What power does the VFE Alpha Dog need?
It accepts an industry standard 9 to 18 VDC power supply with a negative tip. Running it at the upper end of that range gives the internal circuit more headroom than a standard 9V supply alone.
What does the Fat control do on the Alpha Dog?
The Fat control affects the pedal's low end response, letting you dial in how much bass the distortion keeps. VFE describes it as shaping the low end, and reviewers have called it a useful extra control over a standard Rat.
What chip does the VFE Alpha Dog use?
It is built on the LM308N chip, the same op-amp family associated with classic Rat distortion circuits. VFE says the Alpha Dog expands its tone options by adding its unique HCC circuitry on top of that chip.
Does VFE offer a return period on the Alpha Dog?
Yes. VFE offers a 30-day return period on its pedals: return it in new condition within the first 30 days for any reason and get a full refund. Pedals assembled by VFE also carry a 1-year warranty on parts and labor.
Sources (8)
- Alpha Dog, VFE Pedals
- Microsoft Word, madbeanpedals.com, 2019
- The ProCo Rat went from basements to blockbuster albums, Guitar World, 2024-12-12
- Best distortion pedals: top gain stages for guitar, MusicRadar, 2023-01-20
- From Jeff Beck and Joe Perry to Kurt Cobain and Thurston Moore, the Flexible ProCo Rat Has Star Appeal and Staying Power, GuitarPlayer (www.guitarplayer.com), 2022-12-16
- Guitar FX Layouts: Proco Rat 2, tagboardeffects.blogspot.com (Guitar FX Layouts), 2017-04-08
- Guitar Pedal X, GuitarPedalX, 2024-08-30
- VFE_DragonHound.pdf, madbeanpedals.com, 2021
