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  1. Arouse1973

    Stage Line 500W amp repair project

    Now measure across R108, what do you have? Adam
  2. Arouse1973

    Stage Line 500W amp repair project

    No that looks about right for D51. Adam
  3. Arouse1973

    Stage Line 500W amp repair project

    Well I am gob-smacked. I am going to bed now, I'll think about this tomorrow. Adam
  4. Arouse1973

    Popping sub woofer

    On the green PCB top right of it is a funny marking I can't make out, looks like a track with a strange shape. But it might be the lighting. Adam
  5. Arouse1973

    Stage Line 500W amp repair project

    And take it out and do the same.
  6. Arouse1973

    Stage Line 500W amp repair project

    Also can you measure across R117. Adam
  7. Arouse1973

    Stage Line 500W amp repair project

    Yes when you did this.
  8. Arouse1973

    Stage Line 500W amp repair project

    When you measured 0.00V across R108 was the transistor defiantly out of circuit? I just don't understand this! Adam
  9. Arouse1973

    Stage Line 500W amp repair project

    Ok so looks like the transistor is not causing any issues here. This is really puzzling now, how can you measure 0 V across R108 when it should be dropping approx. 3 V. Ahhhh! this is doing my head in. For the same voltage to appear across R108 then it must be coming from somewhere. Adam
  10. Arouse1973

    Stage Line 500W amp repair project

    The PCB. You could meter the base emitter of the transistor also, using the diode feature. Adam
  11. Arouse1973

    Stage Line 500W amp repair project

    So that was with the transistor fitted. If yes then do the same with it removed. Adam
  12. Arouse1973

    Stage Line 500W amp repair project

    Ω set on say 2000
  13. Arouse1973

    Popping sub woofer

    Measure across the speaker terminal in standby, no audio. Adam
  14. Arouse1973

    Stage Line 500W amp repair project

    Yes please and do the same with it removed. Cheers Adam
  15. Arouse1973

    Electromagnetism

    Hello This is homework. We are not being mean when we ask you to do a little work yourself. We will help you if you are really stuck. Have a look and tell us what you think electric and magnetic fields are. Adam
  16. Arouse1973

    Stage Line 500W amp repair project

    H Pete Can we carry on from post #194, it's up to you though. Adam
  17. Arouse1973

    Voltage from rotation

    Ok worth a try. Good luck Adam
  18. Arouse1973

    Popping sub woofer

    Popping subs could indicated a D.C level being applied to them. This could indicate a capacitor as they are supposed to block D.C. You could either replace the capacitor or measure the output with a multi-meter to see if there is and D.C voltage on the output. Adam
  19. Arouse1973

    Amplifier circuit, need some help on high freq and low input voltage

    Hi POP, before we go into looking at the coils which can become quite a task. You will not get very good results from a sine wave with this circuit. You need to use a square wave, I have found a square wave or PWM to be much better in terms of power transfer. This is because the square wave has...
  20. Arouse1973

    Stage Line 500W amp repair project

    Good night.
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