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  1. oldphaser

    Unwell Phase Linear 700 series II

    Don, Most people have no idea how much grief I got from Dean over the 25+ years I worked with him when I replaced the XPL909's, FPL909's, etc with MJ15024 (and later MJ21196) output transistors in series 1 amplifiers. He hated dealing with the oscillations that they created and in some...
  2. oldphaser

    Unwell Phase Linear 700 series II

    Glen, I was asked many years ago either on this forum or elsewhere to post some schematics for the fully comp 700 series two amplifier. I hesitated at that time because I knew there were some errors in the schematics and that some debate would follow. Most notably is the inclusion of the fly...
  3. oldphaser

    PL 200 Help Please!

    As you already know, the 200 series 1 service manual appears to be lacking some details in the meter sensitivity section. I will post it here for others to see. Step #20 Apply enough input signal (2K Hz) to the left channel so that the -12 dB LED comes on, with the meter sensitivity switch on...
  4. oldphaser

    Made a deal on PL700 and PL4000

    The DC offset spec in the Phase Linear 700 service manual (for serial numbers 0 thru 773-200) stated: "using a voltmeter, adjust the offset controls so that the meter indicates 0 (zero) volts at the speaker terminals between hot and ground. The controls are readily adjusted simply by using the...
  5. oldphaser

    Made a deal on PL700 and PL4000

    The Phase Linear 700 (Edmonds Washington version of the) owners manual states: INPUTS "... the Phase Linear 700 is equipped with direct coupled inputs as well as normal coupled inputs. For high fidelity reproduction, the "normal" coupled inputs are to be used. The normal inputs provided...
  6. oldphaser

    It's not getting used and it was a gift from Lee, so it's going to one of you...

    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
  7. oldphaser

    Early PL400 Time to Upgrade

    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.
  8. oldphaser

    PL 700 II Clair Bros Rising from the Ashes

    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
  9. oldphaser

    It's not getting used and it was a gift from Lee, so it's going to one of you...

    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...
  10. oldphaser

    It's not getting used and it was a gift from Lee, so it's going to one of you...

    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...
  11. oldphaser

    Early PL400 Time to Upgrade

    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...
  12. oldphaser

    Early PL400 Time to Upgrade

    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...
  13. oldphaser

    Early PL400 Time to Upgrade

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

    Early PL400 Time to Upgrade

    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...
  15. oldphaser

    It's not getting used and it was a gift from Lee, so it's going to one of you...

    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...
  16. oldphaser

    Early PL400 Time to Upgrade

    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...
  17. oldphaser

    It's not getting used and it was a gift from Lee, so it's going to one of you...

    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...
  18. oldphaser

    It's not getting used and it was a gift from Lee, so it's going to one of you...

    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...
  19. oldphaser

    Early PL400 Time to Upgrade

    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...
  20. oldphaser

    PL 700 II Clair Bros Rising from the Ashes

    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.
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