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Marco, I always try to give credit where credit is due. If it weren't for Dean's willingness to share his knowledge and time with me who knows where I'd be now? "A good friend is someone who makes you better than you might otherwise be". (Mary Maxwell Gates - Bill's mom) Ed

So this has more to do with converting the amplifier to a fully complementary output than something to do with using a WOPL backplane board. This can also be accomplished by re-wiring the output stage like Phase Linear did on all of their fully comp 400 and 700 series two amplifiers.

Joe, Which is easier to accomplish? Rewiring the original output stage or building a WOPL back-plane from scratch? Also what improvements were made to the backplane boards in Rev C versus the previous Revision B? Thanks! Ed

Marco, It was Dean who posted the 4000 service bulletin update on our website. ELECTROLYTIC CAPACITORS IN SERIES 1 (JOYSTICK) 4000's 6/00, UPDATED 6/05 (The first new service bulletin since 1982!) COUPLING CAPACITORS: In the past several years I have noticed a significant increase of IEC...

Marco, As you probably are already aware of, Phase Linear used (2) different versions of RCA pc board mount jacks on the 1000, 2000 and 4000. One has a round body and the other a square body. These RCA jacks have shorting capability when not in use. On the 1000 there are a total of (8) RCA...

I got to thinking about this some more. A.P had mentioned that they were working on a dual rail secondary. Phase Linear started working on the Dual 500 (in 1977) long before the DRS series (in 1981/2) and it too had a dual rail secondary. However it starts on high rail and only switches to...

Yes the amplifier would more than likely continued as it was if it were not for the FTC. A.P. Van Meter told me about the phone calls he was receiving from the FTC on a regular basis about what Phase Linear was going to do to meet the spec. There was little they could do to the 700B as there...

I have revised/edited my previous post (#13) several times.

The Phase Linear 400 series 1 amplifier went into production in December 1971. The change-over from the 4 fin to 8 fin heat-sinks occurred sometime around November 1974. It was as a result of the 1/3rd power pre-conditioning for 1 hour as was required by the Federal Trade Commission "Power...

Mark, Yes I saw that as well. I should have included some verbiage (as noted below) in order to avoid comments (gotcha's) that might follow. There were (2) different IC's used used over the years (and revisions) of the PL10 log amp pc board in Phase Linear 1000 series 1's. The earlier version...

When the Phase Linear 400 series 1 amp was first being developed by Bob Carver in late 1971 it was handed off to Terry Phillips to put into production. It has been many years since I last talked to Terry. Terry also worked for Boeing like I did and he bounced back and forth between the Seattle...

Here is a link to an archived copy of the modifications that James VanDyke did to a Phase Linear 1000: https://web.archive.org/web/20190205224945/http://home.onemain.com/~jvandyke/id9.html I spoke to James a while ago. He was also close friends with a former Phase Linear employee and was able...

I am just completing the restoration of a 1000 series 1 that I have. There are approximately (81) electrolytic capacitors that I replaced with newer Nichicon's. The next steps will be to perform the test procedure steps in the 1000 series 1 service manual. However, it does not list all the...

Phase Linear used a variety of revisions of the PL400C pc boards before they started using the PL14 series of pc boards in 400 series 1 amps. I have (5) examples of the versions of the PL400C. In the attached photos below are (2) early versions with no notation on the backside of the pc board...

The switch that you have in the photo does not appear to be any switch I've ever seen in a Phase Linear amp. It also looks like the hole diameter in the 700 may have been enlarged to accept a replacement switch which is something I often see.

Are you sure that they are Argonne VU meters and not Midland's?

Glen, It is a simple question. You already performed the measurement. So you should already know the answers. I'm not asking you to go back and perform any further measurements. What frequency or range of frequencies (i.e. 20Hz to 20KHz) and output level did you use? Are the results noted...

I edited my previous post to include the following sentences in italics. .......The amplifier will not clip symmetrically when driving a 4 ohm load! As a matter of fact one side of the sine wave will clip far earlier than the other side. (It has been a while but I can't remember if it was the...

Glen Pardon me for the following ramblings..... just putting some thoughts down... Since you are posting incomplete specs, I thought I would ask you to elaborate further. Otherwise they are meaningless. As an example: THD+N in unweighted setting left .01% Right .04% What does this mean...

Glen, At what frequency was the THD+N numbers taken at? Let me guess (1kHz). How about rated output at 20kHz? What was the duration of test when you did the THD measurement? You mention that it does 465 watts into a 7.3 ohm load single channel driven. At what frequency and THD+N? Did you test...