Pete Cornish Battery Free GC-1

The Pete Cornish Battery Free GC-1 is an overdrive and boost pedal with a three-band active EQ and a built-in buffer, launched in 2021 for the company's 45th year of building stage equipment¹. Pete Cornish describes it as a completely new three-stage design featuring both hard and soft clipping stages with automatic switching between them as the gain increases, and says it has a wider gain range than any of the company's previous pedals¹. Each unit is hand built, wired and tested by Pete, Lynda and Mingus Cornish¹.

The "Battery Free" part of the name is the point of difference from the standard GC-1: this version has no battery compartment and runs from a 9V DC adapter only¹. Pete Cornish lists it in its battery free range as a "HIGH GAIN CRUNCH WITH B/M/T ACTIVE TONE BOOST/CUT"².

A three-stage overdrive with hard and soft clipping

Pete Cornish presents the GC-1's circuit as a new three-stage design in which hard and soft clipping stages hand over to each other automatically as the gain control rises³. The maker maps the gain range onto familiar territory from earlier Cornish pedals: with gain at minimum the pedal sits in the Soft Sustain area of the SS-2 and SS-3, low gain gives what the maker calls a Smooth and Transparent Blues Crunch, increasing the gain passes gradually through the gain structures of the G-2 and P-2, and maximum gain reaches what the maker calls High Energy Sustain¹. The maker also describes the sound at low gain as having "amazing Bottom End Retention" and being "Refined and Warm sounding without getting muddy"¹.

The GC-1 is described as a high gain crunch drive that can deliver soft and transparent sustain at low gain levels, '70s Marshall-style overdrive at medium levels, and intense overdrive at maximum gain³.

An independent technical analysis by Aion FX, which traced the GC-1 circuit in 2023, tells a more skeptical story. Their conclusion⁴⁵:

Aion FX found the GC-1's clipping to be the same as the Pete Cornish CC-1, which Pete Cornish describes as having two soft clipping stages, with no hard clipping present⁵. They also note the build uses a vintage-style etched single-sided PCB with epoxy-potted component blocks⁵. On their Cepheus project page, Aion FX describes the CC-1 as "a fully original circuit that's not based on anything else," designed primarily with op-amps, and says the GC-1 was found identical to the CC-1 other than changes in component values⁴.

The controls

The Battery Free GC-1 has five controls: Gain, Bass, Middle, Treble and an output Master Volume. The Master Volume is there, in the maker's words, "to allow for perfect matching between bypassed and boosted/EQ'd signal level"¹.

The neutral position of the three tone controls is 12 o'clock, and equal amounts of bass, mid and treble cut are also available¹. Pete Cornish says the three active tone bands in this family of pedals are completely independent, with no interaction between the Bass, Middle and Treble controls⁶.

Gain: +20dB to +56dB

The gain range is the widest of any Pete Cornish pedal to date, according to the maker¹. With Gain and Volume both at 100%, overall boost is +56dB, which the maker expresses as 640X; at minimum gain the pedal still provides +20dB, or 10X¹. That minimum setting is what puts the pedal into the Soft Sustain territory of the SS-2 and SS-3, so even at its lowest gain the GC-1 works as a substantial clean boost, and the three-band EQ shapes it further.

Power: 9V DC, 20mA

The adapter should be noise free, fully stabilized at 9V DC and capable of supplying 20mA. The coax connector is 5.5/2.1mm with a negative center pin¹. For players running multiple pedals, Pete Cornish recommends the Voodoo Lab Pedal Power 2 Plus as meeting these criteria; for a single unit, the BOSS PSA series¹.

The LD-1 buffer and bypass

The pedal includes Pete Cornish's well established Class A input buffer, the LD-1, together with a radio frequency suppressor¹. The buffer is fully active in bypass mode, which the maker says is there "to prevent losses associated with long cables and/or load impedances"⁷. In other words, with the pedal switched off the signal still passes through the LD-1 rather than a true bypass wire, keeping the high end intact on long cable runs. Players comparing buffered and true bypass designs can read more on the buffer pedals page.

Battery Free GC-1, GC-1 and Deluxe GC-1

The GC-1 comes in several versions. The standard GC-1 takes a 9V battery, preferred type MN1604, replaced through a removable drawer, and the battery switches on when a jack is inserted into the IN/PWR ON jack⁸. The Deluxe GC-1 shares the same three-stage design, the same automatic switching between clipping stages, the same +20dB to +56dB gain range and the same three-band active EQ, and also runs on a 9V battery with the MN1604 preferred type and drawer replacement⁷. The Battery Free GC-1 covers the same ground on adapter power alone¹.

All versions carry the same warranty: twelve months from date of purchase, with repairs of any original manufacturing fault carried out, normal wear, misuse, unauthorized modifications and accidental damage excepted, and the warranty voided if the guarantee labels are damaged or removed¹.

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