Description of Item:
New and improved with 6 LEDs for each meter! Provides more even
illumination than the original 4 LED version and the original PL17 incandescent
version provided by Phase Linear.
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.
Do you own a Phase Linear 700B Amplifier (the one with the 2 big VU meters)? 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 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. This
kit includes the bare board and all electronic components shown in the photo above
and the link to the "crystal clear" assembly instructions and documentation. The
components in the kit will be pre-formed for you as shown in the photo above. The
components you receive in the kit may differ slightly in appearance from those in
the picture above due to parts manufacturer changes.
Your kit includes what you see in the picture above:
- 1 - Brand new upgrade blank PCB to replace the original PL17 incandescent light
bulb board
- 12 - Ultra-bright Blue or White LEDs (specify your choice in the drop down menu when
you order) to illuminate the 2 meters
- 6 - Ultra-bright White LEDs to backlight the Phase Linear Logo
- 18 - 150 ohm meter and logo LED current balancing resistors
- 1 - Bridge rectifier
- 2 - Filter capacitors
- 2 - 1.8K ohm VU meter limiting resistors
- 2 - 22K ohm meter attenuation resistors (for the 0 dB meter switch setting)
- 4 - High Speed Diodes to rectify the signal going to the VU meters
- 2 - Red VU meter connection leads with integral 1/4" ring lug and heat shrink
tubing
- 2 - Black VU meter connection leads with integral 1/4" ring lug and heat shrink
tubing
- 6 - Tyraps to strain relieve attached wires and to neaten up the wiring harness
- 1 - Wooden spacer to properly space the LEDs while soldering (not included if you
order your kit assembled by White Oak)
Detailed photographs, assembly parts list and "crystal clear" assembly
and installation instructions are located at this link below:
There are 6 ultra-bright, wide dispersion Blue (or White) LEDs for each meter providing
a consistent wash of light for meter illumination. You can choose either white or
blue LEDs for your application depending on which LEDs you populate (blue LED part
numbers are specified in the instruction parts list but you can request equivalent
white LEDs at the time you order).
The LEDs are powered with a forward current of 18mA to provide bright, pleasing
illumination while reducing the power requirements by over 80% from the original
board. A current control resistor is provided for each LED allowing you to tweak
with the illumination level if desired.
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. Bare board only kits as well
as assembled and tested versions of this LED light board are available as well on
the White Oak eStore.
Photos of the finished project are shown below (installed in chassis, installed
in chassis (oblique view), front view with BLUE LEDs, component side of the finished
assembly (2 views), solder side of the finished assembly).
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