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Description of Item:
New and improved with 6 LEDs (18 LEDs total) to provide even illumination for each meter and the logo insert!

Premium Version Features:

  • An illumination brightness control for the meter LEDs
  • A separate illumination brightness control for the logo LEDs

Base Version Features:

  • Fixed brightness for each meter and logo.

Both versions provide an 8 position screw attachment wire connector to eliminate any need for soldering, simple mechanical installation.

    Do you own a Phase Linear 700B Series Amplifier (the one with the 2 big VU meters and illuminated logo)?
    It is a great amplifier but maintaining the original incandescent meter light bulbs that frequently burn out can be a real nuisance, Here is your opportunity to replace the original light board with a high-quality, long-life LED powered replacement. You will also notice that those cheap paper light baffles that were on the original PL17 board are gone too!

    This is a brand new, upgrade assembly to replace the original incandescent light bulb board (PL17) with a long life, low power, LED based board assembly.
    You get what you see in the pictures above
    This is the premier Phase Linear PL 700 LED Lightboard upgrade kit on the web. It is a professional-class upgrade product, meticulously engineered to look and perform better than the original. This is the 3rd generation PL700B light board offering from White Oak Audio Design, embodying and enhancing all of the improvements from the prior 2 generations.
Features:
  • 2 separate jumper or switched meter sensitivity settings
  • Adjustable Meter illumination level (Premium version)
  • Adjustable Logo illumination level (Premium version)
The light board allows you to select the meter sensistivity that you desire with 2 settings.  The settings are:

  • 0 dB (same sensitivity as the stock PL board setting)  100W = 0dB reading on the meter scale.
  • -20dB (5x as sensitive as the stock PL board setting)  10W = 0dB reading on the meter scale.

These settings can be accomplished by either:
  • Wiring in the 700B front panel level select switch to the correct 8 pin connector locations, or
  • Installing 2 jumpers in the appropriate position on the 8 pin connector


In addition to the light board assembly, you will receive:
  • 4 - 6-32 hex nuts
  • 6 - Tyraps to neaten up the wiring harness
  • 8 - #6 Nylon washers to correctly space the height of your assembly within your meters (there is some variability in the meters over the years that Phase Linear was in production

There are 6 ultra-bright, wide dispersion LEDs for each meter providing a consistent wash of light for meter illumination. You can choose warm-white, clear white or blue LEDs for your application depending on which LEDs you specify.

There are 6 ultra-bright, wide dispersion, clear white LEDs for the Logo providing a consistent wash of light for logo illumination.

All LEDs are powered with a forward current of up to 18mA to provide bright, pleasing illumination while reducing the power requirements by over 80% from the original board.
  • A single potentiometer allows you to control the illumination intensity of all the meter LEDs to your desired effect (Premium Version).

  • A second potentiometer allows you to control the illumination intensity of all the Logo LEDs to your desired effect (Premium Version).

This is the premier Phase Linear PL 700B LED Lightboard upgrade kit on the web. It is a professional-class upgrade product, meticulously engineered to look and perform better than the original.

This kit includes a brand new, upgrade blank PCB kit to replace the original incandescent light bulb board (PL17) with a long life, low power, LED based board assembly. The components you receive in the assembly may differ slightly in appearance from those in the picture above due to parts manufacturer changes.

Detailed photographs, assembly parts list and "crystal clear" assembly and installation instructions are located at this link below:

Phase Linear 700B Assembly and Installation Instructions


There are 6 ultra-bright, wide dispersion Warm White, White or Blue LEDs for each meter providing a consistent wash of light for meter illumination. You can choose LEDs from those colors for your application depending on your tastes.

The LEDs are powered with a forward current of up to 18mA to provide bright, pleasing illumination while reducing the power requirements by over 80% from the original board. An adjustment is provided for the Logo and Meter LED banks allowing you to tweak with the illumination level to your desire.

A bridge rectifier is located in the center of the board surrounded on the left and right with 2 filter capacitors. This combination provides a smooth, flicker-free DC source for the LEDs. The cool running LEDs eliminate the heat associated with the original equipment incandescent bulbs and last indefinitely. No more replacing those hard to find bulbs and no more discoloration of the meter plastic due to the excessive heat from the incandescent bulbs!!

The printed circuit board is a high quality FR-4 based, epoxy-glass PCB with HASL tin/lead plating on the solder pad areas replacing the cheap original single sided PL-17 PCB. The replacement PCB is 0.062 inch thick double sided circuit board with plated through holes and white epoxy silkscreen legending on the component side and green solder mask on both sides. It is a direct drop in for the original board size, using the original mounting hardware to secure it in the amplifier. This replacement board includes holes to secure and strain relieve the amplifier wire connections to the LED Light board. This feature can be seen pictured in the photos. The original PL17 wire attachment points would often separate from the PCB, ruining the board.

This upgrade kit is for skilled technicians. While building and installation is not a difficult procedure, the installer should be familiar and comfortable with working on electronic equipment and using a soldering station and associated tools. Ensure good control of soldering iron temperature, not exceeding 600 degrees F, so the LED Light Board is not ruined by excessive heat. If you are not familiar with working on electronic equipment or do not possess the proper equipment, it is recommended that you take your amplifier to a service technician that can perform the LED Light Board Upgrade and installation for you.

Photos of the finished project are shown below.
This kit is sold AS-NEW with no returns (due to potential damage to the circuit board during the assembly process).

Ship From Zip Code: 01564

Shipping Weight: 12 oz.

Your purchase will be professionally and neatly packaged for shipment. International orders are welcome

Shipping charges are not included and will be computed based on your 'ship to' location (please provide a ZIP code for USA addresses and your complete address if an international destination).

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