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White Oak Audio Design: Expert Engineering Services and Premium Audio Products

At White Oak Audio Design, we offer custom engineering design services for OEMs alongside a range of high-quality products for audio enthusiasts. OEM customers trust us for our electronic and software design expertise. If you have an idea but lack the in-house capabilities to bring it to life, White Oak is here to help turn your vision into reality. We are a small, agile company with low overheads and strategic partnerships with affordable, reliable suppliers, allowing us to provide top-tier services at competitive rates.

While we specialize in audio and automotive designs, our capabilities extend beyond these fields. Explore our Services page for a full overview of the design tools and capabilities we offer.


Featured White Oak Audio Design Products for Phase Linear Amplifiers

Proudly designed and manufactured in the USA

 White Oak offers premium upgrade kits for Phase Linear amplifiers that are meticulously crafted for superior performance and reliability.

Newest Arrivals

  • PL400 Revision C1 Light/Meter Board – Available in 3 illumination color options, with 3 adjustable meter sensitivity settings and adjustable meter brightness. (with optional wire whip and switch kit)
  • PL700 Revision D Light/Meter Board – Choose from 3 illumination colors with 2 separate brightness controls for logo illumination and meter illumination.
  • PL400/700 Bridge Snubber Kit RevB (with or without 50A/600V Bridge Rectifier)
  • PL400/700 Bus Bar Kit

Standard Offerings

  • PL400 Revision E Full-Comp Only Backplane Board Kit (with optional wire kit)
  • PL700 Revision D Full-Comp Only Backplane Board Kit (with optional wire kit)
  • PL700B or Series 2 Premium Upgrade Chassis
  • PL400 Series 1 or 2 Premium Upgrade Chassis
  • Premium PL700B Upgrade Faceplates – Available in Silver or Black Anodized
  • Premium PL400 & PL700 Series 2 Upgrade Faceplates – Silver or Black Anodized
  • PL400/700 Series 2 Revision C1 Cylon Meter Upgrade Board Kits
  • PL400 15KuF/100V/105C Upgrade Capacitor Kits
  • PL700 15KuF/160V/105C Upgrade Capacitor Kit

Professional Grade Capacitor Upgrade Assembly
 Enhance the power supply of your Series 1 and 2 amplifier with a direct drop-in kit. Swap out original caps for improved capacitance (15,000uF), higher voltage (100V & 160V) and higher temperature rating (105C) for better sound quality, reliability and longer life.

PL14_20 Revision G1 Upgrade Board!
Upgrade your Phase Linear 400, 700, 700B, and 400/700 Series 2 amplifiers with this professional-grade, "universal" PL14A/B + PL20 audio board assembly. Our design improves component quality, PCB layout, and eliminates the infamous "turn on/off thump." It features high-quality resistors, Wima polypropylene, and Nichicon MUSE capacitors. Installation is made easier with Phoenix Contact connectors and premium double-sided PCBs, offering a flexible build for either "stock Quasi-Comp" or "enhanced Full-Comp" configurations. The G1 design also addresses the obsolescence of certain transistors, ensuring future-proof performance.


Vintage Phase Linear Audio Upgrades

White Oak Audio Design is the leader in premium upgrades for vintage Phase Linear amplifiers. Our kits are designed to enhance performance while maintaining the original integrity of your equipment, ensuring that no irreversible modifications are needed. From LED light board replacements to power supply capacitor upgrades, our products improve sound quality, increase reliability, and extend the lifespan of your cherished amplifiers.

Our professional-grade kits are meticulously organized in "paint-by-numbers" style, with each component pre-formed and clearly labeled. Whether you’re a beginner or an advanced builder, our kits cater to all skill levels:

  • Basic Skill Level: Light boards and bulk capacitor kits
  • Advanced Skill Level: PL14_20 control board kits (requires assembly and test equipment)
  • Very Advanced Skill Level: Backplane kits (requires high skill level and test equipment)

Don’t have the tools or experience? We can connect you with skilled technicians to perform the upgrades for you.

For detailed reference documents, contact us via email or through our Contact page.


Where to Purchase White Oak Products

Our audio upgrade products are available through eBay, Phoenix Audio Tape Company, Phoenix Audio Community Forums, and our own White Oak Audio eStore.


Automotive Products for Honda and Acura

White Oak has also developed innovative performance solutions for Honda and Acura vehicles. Our Multi-Purpose Fuel Injector (MPFI) Controller enhances engine output for both naturally aspirated and turbocharged engines, with an easy-to-use Windows-based tuning utility.

Additionally, our "Boost Mask" MAP Clamp—the gold standard for turbocharged and supercharged engines—allows for increased boost pressure without modifications to the ECU. This was the first product we developed and remains a cornerstone of our automotive offerings.



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