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Old 12th March 2009, 08:50 AM   #11
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Q05 is very near Q11. They are both KTA1504Ss. Look up the datasheet for that transistor or the MMBTA56 (the transistor I recommend you use instead of the 1504).



on the kicker amp, i replaced all the outputs/power supply transistors, and replaced the gate resistors with 47ohm so i could use the 3205's. i bought a new 949, and 2 of the kta1504s's , but i just want to make sure which transistors i need to replace...Q05. and Q11 right?

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Old 12th March 2009, 09:08 AM   #12
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Yes. 5 and 11. The emitter of the transistors (Q5 and 11) should go to the gate resistors. Confirm with your ohm meter.
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Old 12th March 2009, 09:58 AM   #13
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yep, they are connected to the gate resistors.

this is my first smt amp. how do i go about removing the 949 without hurting the traces? a small torch? i installed the smt resistors and the other 2 parts on the board fine , but that 949 is very tiny....lol
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Old 12th March 2009, 10:08 AM   #14
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I wouldn't replace the 494 unless it's necessary. You have to be VERY careful on these boards to prevent lifting some of the pads. If you determine it's absolutely necessary, you should use a low temperature alloy to desolder it. ChipQuik is available from Digikey.
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Old 12th March 2009, 10:15 AM   #15
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is there anything i should check before i put some juice to the amp?..
i don't find a short on the speaker wires , or the hot an negative .

put it back in the heatsink and fire it up?
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Old 12th March 2009, 10:34 AM   #16
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Clamp the transistors tightly to the heatsink and insert a 10-15 amp fuse in the B+ line.
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Old 12th March 2009, 11:18 AM   #17
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amp powers up fine........im going to check if it has some sound after i clean it up a little......thanks perry
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Old 13th March 2009, 05:34 AM   #18
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perry, when i put the board back in the heatsink. the amp puts out a high pitch wine. but if i take the board out and lay it on the table , it powers up and has sound.

ive completely covered the bottom of the amp. heatsink and transistors with tape to isolate the board from touching the heatsink. i can slide the board halfway in and is fine, but all the way in it wines ..????
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Old 13th March 2009, 05:39 AM   #19
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Is there a ground lug or ground wire that you haven't screwed down?
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Old 13th March 2009, 05:47 AM   #20
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i have put all the screws to hold the board down, and the heatsink holdowns. it still does that sound... sounds like it is grounding out somewhere.. if i hold the output side of the amp up off the heatsink a little , it will power up fine,

ive taped up the entire bottom of the heatsink the board sets on to. still makes that sound and doesnt power up....i guess its got to be something with the amp..???????
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