Search results

The 8.2K resistors are indeed the ones on the Malco pins. It appears that at least one of them I can actually see writing on; "IRC 8717 PW5 8.2K 10%". IRC is the manufacturer, 8717 is the date code; 17th week of 1987, and PW5 is a 5 watt resistor. So this was not a factory repair. I am not an...

Bill, If your interested in dimensional measurement (as it relates to your machining) as well as Phase Linear........... Well let's just say I have 30+ years experience in both. Ed

My schematics don't show it either. I would hesitate to copy the existing schematics over. There are many errors in them. There were also many different versions of pc boards particularly with the 400 series 1 and 700B. There were a couple versions of PL36 pc boards along with the PRO700...

Peter, The PL36 pc board can be used for either quasi or fully complementary output with some removal of some parts from the quasi version and some jumpers installed. The output stage would also need some re-wiring and (2) additional wires going to each channel on the pc board. Use your fully...

Mark, The gray wire is a center tap between the orange and yellow wires. The orange and yellow are approximately 12 volts for driving the series 2 LED VU meter displays. If you were to use either the orange with the gray or the yellow with the gray you would have 6 volts which would not be...

The 100uF cap was never 63 volts. The schematics are sometimes hard to read and may be missing the decimal. The Phase Linear amps used either 6.3 or 10 volt caps. When the amplifiers failed these would sometimes fail as well. Going up in voltage in not a bad idea.

The t-shirt you may be thinking of may have appeared on the Phase Linear website (hometown.aol.com/PhaseTek) I shared with Dean N. until (10) years ago when AOL shut down all the customer websites on Oct 31, 2008. There is an archived copy of our website on archive.org. However some links no...

Lee, Don't forget. I am still in need. Ed

Don, Unfortunately I don't have anything on the 1400A except an old Sound Technology price list from 1984. Demian Martin on the diyaudio forum is probably your best bet at the moment. He has amassed a large collection of audio test equipment over the years. If he doesn't have it, he may be...

Don, Thanks so much for making the copy! The Loftech TS-1 is a nice handy/dandy device that can fit easily into any sound-mans toolbox. Thanks again! Ed

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...