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Serious input wiring cables!

Ontario Motor Speedway was a great outdoor venue and Tycobrahe Sound did an outstanding job with the sound system including use of the Eventide Clockwork 859-second digital time delay between the front and rear speaker arrays. "54,000 watts of audio power... 105 dB SPL at one mile... 200,000...

The way that the Output Transistors in the Left and Right channels are on opposite sides of the amplifier gives us that stereo separation even in mono recordings... 1956 was a good year!

I saw Black Sabbath play at the California Jam on April 6, 1974. Tony's guitar sounded like 1000 chainsaws on overdrive but the music was so clear, I can still remember the band playing together like a well-oiled machine under Ozzy's maniacal leadership. Tony Iommi was the primary composer and...

The Bias reading will probably not change much, now that you have two rows of Output Transistors installed. The real Bias check is after all your Output Transistors have been installed and the amplifier has been producing some serious music for thirty minutes or so - it will be nice and warm. Or...

I install the thin Nylon washers under the Control Board and under the two Retaining Nuts because I have to remove/replace the Control Board often during a rebuild. And it helps on my Bench Test Mule Amplifiers that I use to test Control Boards for customers. I should install wingnuts!

Yes, because there is a discharge path now through the "Fused" and "Unfused" rails. However, I always measure or just install a 200 Ohm 10W bleeder resistor between both caps, just to be sure. I have seen too many sparks... You are smart to measure!

Joe is generous with the wire lengths going from the Backplane Boards to the Control Board to make sure you have enough. You can certainly trim them so that the bottom cover does not come into contact with them. Completely optional. Measure twice, cut once! Input Jacks look great!

According to Joe at White Oak Audio Design, https://www.whiteoakaudio.com/estore.aspx It used to be a good idea to match the hFE, or Forward Current Gain, of the output transistors to make the amplifier more efficient. Today, with modern robotic construction, better design, and higher quality...

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OK, Send me the invoice, I have the additional parts already so it will not be too painful. I will let the customer pay me in three monthly installments, no interest. I will do the unboxing and installation pictures. Mark

Sure I'll bite. Maybe Joe will give me an allowance for a review here after the installation of the new Meters and Faceplate? Unfortunately, my customer is not a wealthy man, more of a senior on a fixed income kind of guy. (He had two bolts holding a scratched Faceplate on his PL400). I still...

I know we all get tired of reading these type of posts, but... Having checked all the usual sources, eBay, Craigslist, Audio Mart, Reverb, Audiokarma, etc. I have had no luck finding a pair of PL400 VU Meters. If anyone has a pair (of meters) I need them for a customer's PL400. They can be...

Blaze, you "could" share a link for those of us that are not so good at searching the videos on You Tube...

I don't know the cost of a Rolls SX95, it seems very complicated if you just want to bridge two channels of a stereo amp for a single output to feed a subwoofer. Phase Linear recommends a small metal enclosure to prevent any environmental noise and it could be handy to install Input and Output...

Our source for Phase Linear components is: https://www.whiteoakaudio.com/estore.aspx But many of the technicians here carry parts such as the output transistors.

Will they replace it at no charge? I blew a 18" CV Musical Instrument Speaker (likely old age) that was doing duty in an Acoustic 301 Folded Horn Cabinet. I set it on the counter at CV (3762 S. Hill St. Los Angeles, CA) and the girl working there took it and came back with a new or refurbished...

Of course, a side by side test of your upgraded SII 400 and the ML amplifiers will be required.

You can bridge the Phase Linear amplifiers, but you have to do it correctly. The 700B Owner's Manual says to never connect the outputs together! There was an undated Service Bulletin describing the technique for correctly "Bridging" the 400, 400 II, 700, 700B, and 700 II into 8 Ohms or greater...

Clipping the Model ONE. I knew if anybody could do it, it would be Lee.