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PFKMan23

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Posts posted by PFKMan23

  1.  

    The circuit is completely identical.  Only thing I've done is remove those bloody mosfets which should never have been there and fix the CCS.  So now the output capacitance is cut down to less than 10pf and the huge bump in distortion from the old CCS is gone. 

     

    So then it's more like the circuit properly implemented?

  2. What is the cause of a poor soldering?

    a - Worker without skill experience;

    b - Thin PCB substrate and thin traces that cannot handle the temperature; or,

    c - Soldering station without temperature control?

    All of the Above?

     

    That is certainly possible.  Sent the pics to two people I know who assemble PCB's and they are appalled.  Not just the soldering but also how utterly impossible any rework is. 

     

    I've stripped all unnecessary parts off the amp board so I can start building it up again.  Already installed are terminal blocks for the input , new power LED (hate blue led's) and safety output resistors.  Next up are new BJT's for the output and 2SA1968's for the CCS.  Then the amp will be ready for testing again.

     

    After that I have to turn my focus to the PSU.  The bias supply is utterly fucked and not safe to use.  Then I'll add loopouts to the back and rewire the input section. 

     

    So we're talking a total rebuild, which would yield more or less a totally different amp?

  3. Cool.

     

    As for me, I worked out this morning, did the general job, then covered an evening group for a co-worker where I witnessed a mother telling her son (the son is the one in treatment) that if she had to give up alcohol to have a relationship with her son, she'd choose the booze.  She didn't even blink.  I've worked in this field for 14 years, have heard most everything, and rarely have a personal reaction, but she was so fucking cold and cruel, I was almost willing to lose my job to just punch her out.  I'm still pissed. 

     

    My god.  

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