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Very good question! I had to go back and take a look at some of my Clair Brother amps to be sure. It appears that Phase Linear went to using a .22uF capacitor in place of the .1uF caps they used in earlier amps. It appears from looking over some service manuals that Phase Linear did use some...

Is your 2000 a series 1 or a 2000 series two? I have a very good supply of "New Old Stock" Phase Linear parts obtained from former Phase Linear employees. Phase Linear parts list for the 2000/ 2000 II shows (2) part numbers: 129-0037 Balance: 50K: NL: dual 129-0026 Balance: 100K: L It appears...

Peter, We have already had this discussion on the phone. The 50 watt 5 ohm Dale RH-50 resistors (in the Zobel network) were used by Clair Brothers because they drove the amps hard into clipping above 8kHz into a 4 ohm load. These Dale resistors have a maximum voltage range of 1285 volts. The...

I have an interesting collection of very rare Phase Linear amplifiers including the following: 1.) Bob's 1 of 3 bridge amps built which was the first Phase Linear 700 built back in early 1970. 2.) Phase Linear 700 (Kelly DeYong) amp. Also early 1970. Has trim-pots in the protection circuit. 3.)...

Joe, Good to know that your will work down to 5V. Most of the LED meter displays I've seen use IC's which require at least 9 Volts or so. I do have an interest in pursuing this. Let's talk more about this after the summer season is over in a month or so. Ed

Fred, I had as many as 150 Phase Linear amplifiers at one time. I only wish I had them all (and the knowledge on how to repair them) back in the late 70's/early 80's when I was a sound-man. Ed

https://forums.phxaudiotape.com/threads/phase-linear-700b-rack-handle-history.8726/

Joe, I have half a dozen chassis with 700/700B series 1 transformers in them that I'm building from scratch along with a bunch of 700 series II front panels. Since the 700B VU meters are practically unobtanium these days I have found it easier to buy broken 400 series II amps just to get the...

If a 700 or 700B series 1 (or for that matter a 400 series 1) transformer is to be used with LED style VU meters (i.e. Cyclons) typically you would need to provide it with 12 volts AC as the series 1 amps came with a 6V secondary for powering the incandescent bulbs. I happen to have a prototype...

Just a note in case you weren't already aware....... The Phase Linear 5000 has fixed and variable outputs. By the way, the 5000 also uses the same Switchcraft 3501FR RCA jacks some of the amplifiers used which become loose over time. Usually it is just the pair that is normally used that...

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