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Saw them in Hartford CT last nite. They are awesome with Christine McVie back in the line up. Venue was great and play list was complete.

If you are trying to debug whether your PL amp problem is on the backplane side of things or on the PL14 control board and wish to do that without blowing fuses or damaging output transistors, this debug trick may help you perform the debug without causing further damage. After you have...

DeOxit makes a number of contact cleaner products. Which version do users here like the best? My old PL4000 has some crusty controls in it that are no longer reliable, especially the source selector switch is showing a lot of the black silver tarnish on it. The stuff is not cheap so do not...

As I am rebuilding my lab PL700 mule into a full comp version with the new backplane boards I am noticing that the negative side heat sinks (the quasi comp side) show evidence of much more heat than the upper positive half of the same channel. This discoloration is the purpling effect that the...

Normally list for $399 each, now $149 with promo code EMCYTZT5365. Shipping is $1.99. So for all you speaker deficient guys out there, this seems like a decent deal.

Some rework hints: If you intend to change the Backplane boards from one configuration to the other, make sure that the component leads you solder in are straight and NOT FLARED on the backside of the board. Flaring the leads will make it a bear to remove them. The Backplane boards have huge...

Lee hinted around at this the other day. It is time to open it up more broadly in this forum as it is ready for prime time. Highlights: Offers 2 header based jumper modes - a small shunt jumper with handle allows you to quickly move between the 2 meter modes on a set of 3 pin headers. Mode 1...

Lee hinted around at this the other day. It is time to open it up more broadly in this forum as it is ready for prime time. Highlights: Offers 2 header based jumper modes - a small shunt jumper with handle allows you to quickly move between the 2 meter modes on a set of 3 pin headers. Mode 1...

This post is to provide a set of guidelines for selection as the sources for original devices are drying up and substitutes will have to be sought. First let's get the definitions clear: Pre-Drivers are classic RCA410 location. Typically Q11 and Q12 in the PL400 and the PL700B. Drivers are...

Damping factor is VERY important for good driver control, especially bass drivers at low frequencies near their resonant points. Amps with low damping factor suffer from poorer bass response and control and generally what can be described as “flabby†bass rather than “punchy or well...

The mass of the transformer on the Phase Linear 400 and 700 amps, coupled with the relatively weak aluminum chassis and rough shipping and handling can cause the chassis to develop a slight bend between the inside edge of the transformer and the first heat sink fins. This area is the high...

Listing for a friend in FL. Very solid preamp, build quality is over the top. Cosmetics are excellent all the way around. Works perfectly (listening to it currently), just serviced it for him. He is asking $700 for it.

After some extensive beta testing (thanks Lee) on this new board version, we are pleased to say that it is now generally available. It continues to build on the White Oak Audio commitment to continuous quality improvement in the design and components used on the board assembly. Below are the...

Star ground details for PL700B, the following wires attach to the copper bus bar "star point" ground (these connections are effectively CHASSIS GROUND in the PL700B): 1. Main transformer center taps (generally 2 wires) 2. B+ 9800uF cap, negative post 3. B- 9800uF cap, positive post 4. Left...

I wrote this recently in response to a question and thought I would post it on the forum too.

I recently rebuilt a PL700B for a friend, this BLOG is a result of that. It has been years since I rebuilt my own PL700Bs (before the age of internet BLOGS) so had forgotten most of what I rediscovered with this rebuild. I always enjoy seeing the inside of an amp where all the wiring seems...

Hi Ed I cannot answer this, perhaps you know the answer to this question. Do you know at what serial number the Phase Linear 400 SII changed from quasi-complimentary to full complimentary? I have one of each and just wondered. Any help is appreciated. Thx Joe

Setting the Bias on the PL14_20 Board Initial setting of the amplifier bias is a very simple procedure with the White Oak Audio PL14_20 board assembly. The bias is not all that critical and will drift around somewhat as the amp warms up. Do not be concerned that the setting is rock solid. It...

Thought some of you might enjoy the nostalgia. If you don't know Bob's work, there is a sampling of links in the article about analog design and topics. http://electronicdesign.com/article/ana ... _ED-04_575" onclick="window.open(this.href);return false;

Looks like everybody is doing spring cleaning and marketing their PL400's this week. At least one PL700B going too. I cannot recall a week where I have seen as many as this week. Lee and Mark, you guys may have a wave of repairs coming at you :-)