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Old 17th November 2012, 01:56 PM   #11
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So far, you haven't provided any information to indicate that any components are actually defective.

What size fuse did it blow?
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Old 18th November 2012, 01:20 AM   #12
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Blew the 20A fuse,but heard a faint amount of music before it blew, tried several fuses at various gain levels to see if anything would change. Also one of the transistors has a burn mark, the one in the picture. I'm confused by all the math in calculating things though, soo many numbers & I get confused. What would you recommend I do?
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Old 18th November 2012, 02:38 AM   #13
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Post a good quality photo of the transistor that appears to be burned.
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Old 17th June 2013, 09:03 PM   #14
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Sorry its been so long but I managed to take better pictures of the bad transistor.
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File Type: jpg IMG_20130617_134207620294366.jpg (362.5 KB, 36 views)
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Old 18th June 2013, 12:03 AM   #15
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They are 2sd1065, they appear to be in the power supply section. If one of them blew up (as shown in the picture) it is a good idea to replace all of them (2sd1065) also check to see if there's any resistors on any of the three pins for that transistor, they may be damage and will also need replacement. Once you remove the board check the bottom of the board for any components (SMD) that may be damaged as well (if it has any, not sure as I don't have that amplifier or schematics).


Once you replace all four transistors, power it up with a 5-10amp fuse to protect the amp from any further damage.


BTW, Perry is very busy with other projects so he wont be able to help for the time being. He has helped many here and we will try to help as much as possible.
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Old 18th June 2013, 05:38 AM   #16
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would you recommend replacing them with a better type or getting exact the same?
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Old 18th June 2013, 06:46 PM   #17
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There might be better subs out there but if you can't compare data sheets then I suggest sticking with originals. Unless someone that has sub that specific transistor has experience then they might suggest it to you...unfortunately I haven't so I can't comment on that.

You can also use certain web sites that allow you to insert certain data and they will provide a list of possible subs. Google that specific transistor and you might get some good leads on finding a sub with better specs. Other than that then stick with original.
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Old 18th June 2013, 08:18 PM   #18
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Also, how do I check the resistors next to the trans? they aren't giving accurate readings, unless my multimeter is malfunctioning, why do they all say 0.01 ohm?

EDIT: 145ohms, must have not plugged the leads in properly.


Is it normal for resistors placed next to components to give off enough heat to leave brown marks on the nearby capacitor?
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Last edited by Madjimms; 18th June 2013 at 08:27 PM.
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Old 18th June 2013, 09:46 PM   #19
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According to the picture it should read 180ohm with a tolerance of 9ohm, so anything between 171 and 189 is acceptable.

145ohm is off of tolerance and should be replace with a 180ohm 5% 1watt (or 2watt) resistor. Looks like a ceramic resistor.
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Old 19th June 2013, 05:59 AM   #20
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I've tried googling schematics for ages,anyone have some?
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