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    Need help verifying if the PL14_20 Control board kit will work in my 400S2

    Regarding 3. ... what is up with that? Meaning, why disconnect the AGND link from the backplane to the control board and instead use the star point/bus bar ground? Is this particular to the Series II or should other builds (PL400, PL700, etc) also do this?
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    Change in bias test point readings upon adding 2nd row of power transistors - FullComp PL400 build

    Follow up: completed re-assembly and final testing last night., And ... first tune was Funk #49. Oh. My. Gosh. So good. Out of the gate. It's time to let her run for a while and see where we go with this. BIG thanks to Joe for providing a truly superior product at a very reasonable...
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    Change in bias test point readings upon adding 2nd row of power transistors - FullComp PL400 build

    Thanks, George and Joe. I found it. R21 (1/2 W 10 Ohm) seemed to test ok at the pads, but testing the resistance between XQ7 emitter and TP4 I found a couple megaohms resistance. Reworked it with a bit more solder on the top side of the board and all is bueno now. Onward. Cheers and...
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    Change in bias test point readings upon adding 2nd row of power transistors - FullComp PL400 build

    Greetings all, typical newb here ... I've enjoyed reading all y'alls posts over the past few years as I've dreamed of giving my beloved PL400 the FULL WOPL treatment. I pulled the trigger a few months ago and have been working as time permits to get it done ... So, I'm merrily rounding what I...
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    Bipolar transistor grading

    Thank you! I'm glad I asked and appreciate the additional heads up about orientation. "Nothing is less productive than doing well that which doesn't need doing at all." - anonymous wise man
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    Bipolar transistor grading

    A very interesting thread that has me contemplating the looming drivers installation on the PL400 that I'm giving the full WOPL treatment to thanks to Joe's FABULOUS kits. Wow, White Oak's products are truly top notch in terms of buildability and quality. Anyway, so given that I have nice...
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