What is the purpose of the MIX and DWELL pots?

The MIX pot adjusts the dry/wet balance, while the DWELL pot adjusts the bit reduction rate.

How does the true bypass feature work?

The true bypass footswitch allows you to switch between the chorus effect and bypass status without affecting the signal chain.

What is the package weight and size?

The package size is 12 x 7 x 7 cm (4.7 x 2.8 x 2.8 inches) and the weight is 196g (6.9oz).

Custom Grand B-Box Electric Guitar Preamp Overdrive Pedal

Name: Custom Grand B-Box Electric Guitar Preamp Overdrive Pedal
Brand: Shenzhen Grand Technology Co., Ltd.
SKU: 1967069745

Guangdong, ChinaShenzhen Grand Technology Co., Ltd.

US$15.68-20.68

100 Pieces

Sample price:US$20.68/piece.Request sample

Product profile

Customization

Available

Material

Metal

Type

Preamp Overdrive Effect Pedal

Model NO.

JF-122

Power

DC 9V

Input

1/4" Monaural Jack

Output

1/4" Monaural Jack

Transport Package

Neutral Package

Specification

12*7*7(cm)

Trademark

Grand

Origin

China

HS Code

8543709990

Production Capacity

10000PCS/Month

Key features

Full Metal Shell Construction: Durable zinc aluminum alloy body ensures long-lasting performance and portability.

True Bypass Footswitch: Switches seamlessly between chorus effect and bypass status without signal loss.

Four Functional Control Knobs: Gain, Volume, Bass, and Treble knobs allow precise adjustment of the overdrive effect.

LED Status Indicator: Visual LED light indicates whether the effect is active or in bypass mode.

Compact and Portable Design: Small dimensions (4.7 x 2.8 x 2.8 inches) make it easy to carry on stage or in a bag.

MIX and DWELL Pots: Adjust dry/wet balance and bit reduction rate for unique sound textures.

Standard 1/4 Inch Jacks: Features standard 1/4 inch monaural input and output jacks for easy connectivity.

Professional Manufacturing: Produced by a factory with 15 professional engineers ensuring strict quality control.

Company profile

Shenzhen Grand Technology Co., Ltd.Guangdong, China

Business Type: Manufacturer/Factory, Trading Company, Other, Group CorporationExport Year: 2015-04-20Nearest Port: Shenzhen ShekouAverage Response Time: ≤10.65hTerms of Payment: LC, T/T, PayPal, etc.International Commercial Terms(Incoterms): FOB, EXW, CIF, Others

AI-Powered supplier vetting

SummaryShenzhen Grand Technology Co., Ltd. is a China-based limited company identified as both a trading company and manufacturer/factory. It supplies a broad range of musical instruments and related electronics, including guitars, amplifiers, pedals, pianos, and percussion products. The supplier reports ISO 9000 and ISO 9001 certifications, 11–20 years of combined R&D engineer experience, 6–10 quality-control staff, five production lines, and substantial stated annual output for selected products. Exports account for 90% of total sales, with markets spanning multiple regions. The company states that it provides after-sales service and seeks long-term partnerships, but the available information does not independently verify service performance, customization capability, financial strength, or detailed customer references.

Supplier typeThe supplier is explicitly classified as a trading company, manufacturer/factory, group corporation, and other, with a China origin and Guangdong operating province. Its product portfolio and reported production lines and output support involvement in manufacturing as well as trading and export activities.

CertificationsThe supplier reports holding ISO 9000 and ISO 9001 management-system certifications. The slices do not provide certificate numbers, issuing bodies, validity dates, or scope, so the assessment is based on the stated certifications only.

After-Sales capabilityThe company explicitly states that it builds consumer connections through excellent after-sales service and welcomes improvement suggestions. However, no service-process details, response standards, repair resources, or performance records are provided.

Production capacityThe supplier reports five production lines and substantial annual output, including 100,000 guitar amplifiers, 100,000 guitar pedals, 150,000 electric guitars, and 150,000 acoustic guitars, plus 1,500 guitar pianos. These stated capacities provide explicit evidence of production capability across multiple product categories.

Product Q&A

Q:What is the power supply requirement?

The pedal requires a DC 9V AC adapter with a center minus plug. The adapter is not included in the package.

Q:What is the correct polarity for the power adapter?

Please use an adapter with the positive pole outside and negative pole inside. Incorrect polarity may cause the product to malfunction.

Q:Does this pedal include a power adapter?

No, the power adapter is not included. You must purchase one separately that matches the DC 9V center minus specification.

Q:What materials are used to build this pedal?

The pedal features a full metal shell made of zinc aluminum alloy for durability and a compact size.

Q:What functions do the four knobs control?

The four knobs control Gain, Volume, Bass, and Treble to adjust the performance of the overdrive effect.

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Custom Grand B-Box Electric Guitar Preamp Overdrive Pedal