symmetrical 400 problem...bias setting - Page 2 - diyAudio
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Old 13th October 2003, 12:24 AM   #11
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It is cool that you have it working, though! Just a layout issue, the base is in the middle so it can connect to the wiper of the potentiometer. (My sym amps are doing fine, and ironically I made the same mistake earlier and blew some stuff up.)
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Old 13th October 2003, 02:08 AM   #12
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I understand that they layout works out better...but DANG...he needs to put a note in the contruction notes since that actual layout is different than the pinout. I also know that Anthony has pretty much jumped off the planet ...Anthony, please post here and prove me wrong....but still. I hope that whoever else builts this amp notices that CBE and BCE are DIFFERENT LAYOUTS!!! and careful attention needs to be payed as to where this goes. I have had zero zero zero problems other than this, and from reading this knowing what to search for...I realize I'm not the only one. Boy is the bass on these amps SWEET. Later!

-Matthew K. Olson
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Old 14th October 2003, 12:14 AM   #13
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To be fair, the construction manual says: "Q10 will need flying leads soldered from the Base, Collector and Emitter pins of the BD139 to the appropriately marked pads on the PCB shown as Q10." And also, "For the time been temporarily wire up Q10 via flying leads. Making sure that you match up the Collector, Base and Emitter pinoutís on the PCB, with the Collector, Base and Emitter pinouts on the BD139." I know, it's sort of unfortunate he isn't very communicative anymore.

But, that's water under the bridge! Yes, the amps can really kick.
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