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The "bypass" capacitors are there to help eliminate high-frequency oscillations particularly when Phase Linear began using faster devices like the TP9054 (MJ15024's). These oscillations may be seen when testing the amplifier at 20kHz at rated output. (NOTE: You will need to use an output from a...

Ron, I don't have any plans to pursue working on Dual/D-500's. However, there will be some special occasions from time to time. Phase Linear 700's are the only amps that interest me at this time. 400's are hardly worth the effort. I still plan on seeing you and helping out in anyway I can. Ed

If you intend to use the 470uF capacitor to lower the frequency response in a Phase Linear Dual 500/D-500 or a Phase Linear 700, 700B or 700 series II amp with Don's relay board in it you will not be able to realize full output at 5Hz because the relay board will trip when driven at 5Hz at...

I made a few edits to my previous post.

Fred, Although your original post centered around the PL-36 pc board..... Perhaps I should also address the other kinds of issues that can come up with a Phase Linear 400 series II. Phase Linear used a variety of power supply capacitor manufacturer's and about the time the fully comp amps came...

C111/211 (100uf/6.3V or 100uF 10V) usually only becomes an issue after the amp has had a failure (i.e. blown output transistors, etc.) However, it could be replaced as a matter of course with a higher voltage rating (i.e. 35V). Replacing these caps with a higher value (i.e. 470uF) will lower...

Glen, Now that you've done your fifth conversion, does this mean you have some spare PL-32 driver boards available? I have no plans to do any conversions on Dual 500/D-500's. I am getting older and time is getting more precious to me. I need to be enjoying my retirement years. Have you tried...

You should replace as a matter of course the (2) Rockwood brand 7.5K ohm 5 watt resistors and the (2) 7.5K 2 watt resistors. The Rockwood brand were known to have a higher than normal failure rate. (Phase Linear also used a TRW PW5 series later on that was much more reliable.) The 7.5K ohm 2...

Glenn's amp may well be the only fully comp White Oak'd D-500. However, there was at least (1) factory fully comp Phase Linear D-500 and it is owned by Ray Reed (former Phase Linear employee). I saw it at Dean Nissen's house a number of years ago. Ray, Dean and I organized Phase Linear re-union...

Steve Mantz returned my phone call and sent me the following e-mail: I made a spread sheet of the SOA for the PL400/700 for 2 devices If you would like to post this on the Phoenix forum please feel free. If anybody would like to ask me questions I will be happy to answer them. If there is an...

Bob Cordell has come out with a 2nd edition to "Designing Audio Power Amplifiers". http://www.cordellaudio.com/ It should be available sometime this May through Focal/ Routledge: https://www.routledge.com/Designing-Audio-Power-Amplifiers/Cordell/p/book/9781138555440 and will become...

Designing A 700 Watt Amplifier, Seven hundred Watts for domestic listening – Phase Linear explain why by Robert Carver Electronics Today International November 1972 see pgs 60-63, 71, 72 https://www.americanradiohistory.com/Archive-Electronics-Today/70s/Electronics-Today-1972-11.pdf NOTE...

(Phase Linear 700 Review) "Seven Hundred Watts RMS" Electronics Today International September 1972 see pages 56-59 https://www.americanradiohistory.com/Archive-Electronics-Today/70s/Electronics-Today-1972-09.pdf You might also want to take a look at: Damping Factor – just a sales gimmick...

Don, I see that you have a Loftech TS-1 Audio Test Set. Did you by any chance get a copy of their book: "Audio Measurements: Their Importance and How to Make Them" by Larry Blakely, John H. Roberts Phoenix Audio Laboratory (Loftech) 1982 87 pgs This book was a free companion piece for the...

Don Imlay sent me this link 2 weeks ago: Vintage scopes are better part 2 by Jim Williams http://readingjimwilliams.blogspot.com/2012/02/vintage-scopes-are-better-part-2.html Vintage scopes are better part 1 by Jim Williams...

Here is a list of books and articles. Many have active hyperlinks. Hopefully, you will find something of use. If you are interested in specific methods to measure rise time, slew rate, phase, etc using oscilloscopes, I have a list of books and articles for that as well. Books: Encyclopedia...

click on the hyperlink below to open the article.... An Informal History of Solid-State Amplifiers by Daniel Sweeney, Steve Mantz Audio Magazine June 1988 pgs 46-55

Here is a old article.... Click on the hyperlink below. Rise Time Measurements: What You See May Not Be What You've Really Got by Raymond E. Herzog Popular Electronics August 1972 pgs 60, 61

With regards to measuring rise time and/or slew rate: Typically you would generate a square wave with a signal generator/oscillator capable of sine, square and triangular wave-forms. These signal generators are also known as function generators. The square-wave signal would go into the input of...

It appears that the AP ATS-1-DD analog output spec for the square wave; rise/fall time is "typically 2.5 - 3.0us". NOTE: The rise time for Phase Linear 400, and 700/B series 1 amps were 1.6-1.7us and the 400, 700 series 2's were 4us. Ideally, you should have an accuracy ratio of 4-5 times...