Description of Item:
This is the premier PL400 Capacitor 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 400 Series 1 Amplifier (the one with the 2 big VU meters)
or the Series 2 with the LED based Cylon meters?
It is a great amplifier but it has always been deficient in bulk storage capacitance
in the power supply. Coupled with that, 40+ years has taken its toll on the quality
of the original capacitors installed in your amp. You are not getting the bass punch
that this amp is capable of and you are living with a noise floor that is far worse
than it can be.
Here is your opportunity to replace the original pair of 5900 uF 85V capacitors
(some vintage PL400s may have differing values such as 7,300 uF 75V) with a high-quality,
long-life replacement pair with a capacitance value of 15,000uF 100V.
This is a brand new, fully assembled, bulk capacitor upgrade to replace the original
worn out electrolytic power supply capacitor pair with brand new pair of modern
high capacity electrolytics. Like all White Oak Audio Products, this kit is a direct
drop in for the original. The results below speak for themselves.
This scope trace is what your power supply voltage rails looks like BEFORE the upgrade while playing normal
program material at ~2W output:
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This is a complete, ready to install assembly including all the electronic components
as shown in the photos above and the link to the installation instructions and documentation.
The components you receive in your assembly may differ slightly in appearance from
those above due to parts changes by the component manufacturers.
Quick and easy installation involves:
- Removing the top cover from your Phase Linear amplifier
- Removing the faceplate assembly from your Phase Linear amplifier
- Removing the original capacitor hold down bracket
- Removing your original bulk capacitors
- Removing the wires from the original capacitor screw terminals
- Reattaching the wires to the new White Oak Audio capacitor screw terminals
- Re-installing your new White Oak Audio bulk capacitors
- Reinstalling the new White Oak Audio hold down bracket
- Dressing and neatening up the wiring
- Reinstalling the faceplate assembly on your amplifier
- Reinstalling the top cover on your Phase Linear amplifier
- Enjoying your new upgrade
You get exactly what you see in the picture above which includes:
- 2 - White Oak Audio Design upgrade PCB (double sided, computer grade, with
silkscreen and solder mask) assembled to the 2 capacitors
- 4 - High quality, 100V, 105C, 40mm diameter snap in capacitors.
- 4 - RAF Electronics 3077-B-1032-B solid brass swage standoffs, 5/16" OD x 3/16"
long, internally 10-32 threaded
- 4 - 10-32 x 1/4" machine screws with 8 internal tooth lockwashers
- 1 - 6061 0.090" thick aluminum alloy, precision laser cut capacitor hold down plate
to replace the original Phase Linear bracket.
- 1 - 10-24 threaded rod, 1.875" long with 2 - 10-24 SS hex nuts, 2 - #10 SS
internal tooth lockwashers and 2 - #10 SS flat washers.
- Complete subassembly by White Oak Audio
Design as shown in the first picture!
Capacitor Stackup Options:
- 15,000uF, 100V Pair (30,000uF total capacitance). 2 - Premium rated Capacitors, 15,000 uF, 100V
40mm x 105mm. Overall
length approx. 125mm with the cap boards installed.
Detailed photographs, assembly parts list and "crystal clear" installation instructions
are located at this link below:
New capacitor specifications:
- Total capacitance per rail: 15,000+/-20% uF vs. 5900 uF original (some vintage
PL400s may have differing values)
- DC working voltage per capacitor: 100V steady state/125V surge vs. 85V steady state/100V
surge original
- Capacitor maximum operating temperature: 105 degrees C vs. 85 degrees C original
- Capacitor maximum ripple current: 7.8A minimum at 120 Hz, 85 degrees C for each
capacitor
- Capacitor maximum ESR: 0.021 ohms maximum at 120 Hz, 25 degrees C for each
capacitor
This upgrade assembly is easy to install but requires some skill. While installation
is not a difficult procedure, the installer should be familiar and comfortable with
working on electronic equipment and using associated tools. 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 Capacitor Upgrade installation for you. Bare board only and complete ready to
build kits are available from White Oak Audio Design ( whiteoakaudio.com)
or on possibly on Ebay if we happen to be running such auction at the time.
The printed circuit board is a high quality FR-4 based, epoxy-glass PCB with HASL
tin/lead plating on the solder pad areas. The PCB is 0.062" thick double sided circuit
board with plated through holes and white epoxy silk screen legending on the component
side and green solder mask on both sides. This capacitor assembly is a direct drop
in for the original capacitor size, using mounting hardware supplied in the kit to secure it
in the amplifier. This replacement kit includes a new, high quality, aluminum
hold down plate to replace the original.
Watch for other innovative Phase Linear upgrades that are always coming from White
Oak Audio Design.
Photos of the finished project are shown below (installed in chassis before and
after).
BEFORE:
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Applicability of Kit: The White Oak Audio Design PL400 Capacitor Upgrade
Kit replaces only original Phase Linear 400’s that are equipped with 1.75” diameter
by 4.125” long screw terminal capacitors as shown in the above figures. It is not
for replacement of any other type capacitors or terminal configuration. If your
original Phase Linear amplifier does not match these requirements or look like
these photographs, do not install
this kit without contacting White Oak Audio Design first for guidance.
This kit is sold AS-NEW with no returns (due to potential damage to the circuit
board once assembly has begun).
Ship From Zip Code: 01564
Shipping Weight:1 pound 8 oz.
White Oak Audio will ship via USPS Priority Mail worldwide for Cap Assemblies at
buyers expense. When ordering from the eStore, please let us know your ship to destination. If you require other than
USPS Priority shipping service, buyer will be responsible for shipping charges by method selected
on the shipping weight stated above. If you do not pay for shipping insurance, delivery
will be made totally at buyer's risk for loss and damage.
Your purchase will be professionally and neatly packaged for shipment within the
standard USPS Priority Mail Box. International orders are welcome.
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