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  1. King bleu

    Phase Linear 700B

    I have successfully got the amp stable. I went through a few output transistors in the process. Five in total. DC offset left 18mv Right 17mv. Idle current left 390mv right 402mv. Right trim pot is fully CCW. On start up right idle current is around 450mv then stabilizes after 10 minutes or so...
  2. King bleu

    Phase Linear 700B

    Yep. Starting at 20Hz and going up it went Kaboom at 4k. Running 4.4RMS about 242 Watts. Looks like one output shorted.
  3. King bleu

    Phase Linear 700B

    After rechecking DC offset Im getting Left 20mv Right 15mv. I probbably didn't have a good connection on the speaker terminal the first time I checked. I took out Q1 and Q2 from both channels and measured HFE. I took the best match and installed them on the Left channel. Now I get DC offset...
  4. King bleu

    Phase Linear 700B

    So far so good. I installed the output drivers and predrivers. Replaced the few electrolytics on the driver board. Tested all transistors on the driver board. The amp is operational. DC offset on one channel is in the milivolts and about 7.0v on the other channel. One problem I need to solve is...
  5. King bleu

    Phase Linear 700B

    If this was mine I would give it the royal treatment. This is for someone else who doesn't want to put money into it. The goal is to get it running safe and operational. However I understand this may not be possible without a total restore of the driver board and a speaker protect relay. I will...
  6. King bleu

    Solid state junkie

    Solid state junkie
  7. King bleu

    Phase Linear 700B

    Good news. Someone has come to the rescue and has offered me two RCA 410 and two XPL909. Is there anything I should address on the driver board PL20. Im not looking for mods at this point but rather things like known suspect transistors or caps / diodes in crucial places.
  8. King bleu

    Phase Linear 700B

    I emailed white oak. They have the output drivers availale on their website but I don't see the pre drivers on the website. Hopefully they will have one for me. After testing the XPL909 outputs I have determined that two of them are shorted. If I can find 2 original XPL909 that would be the...
  9. King bleu

    Phase Linear 700B

    I have a shorted pre driver RCA 66546. Does anyone have a RCA 410 Or is there a modern day equivalent I can use. Thanks This unit has the XPL909 outputs
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