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Old 6th April 2008, 03:24 PM   #1
ppia600 is offline ppia600  United States
diyAudio Member
Join Date: Jun 2007
Location: Louis y ana
Default jl audio 300 2

Hi, I searched around and couldn't find one single thread on a jl audio amp, even though I could have sworn there was one just a couple of weeks ago. Anyways, a friend had one given to him by a customer and he wanted me to check it out. He says it plays both channels but one is distorted. I immediately thought it would be at least one bad output.. and sure enough it was. There is only one irf530 that is shorted, the rest read fine with it out of the circuit. I just have a few questions:
-I had a heck of a time getting the transistor clamp off and was wondering about the best way to put it back on.
-Should I go ahead and replace both 530's on the bad channel to be safe? And if I do, will I need to adjust anything or should it work fine assuming nothing else has been damaged?
My friend works for a dealer of jl so he could probably get it repaired at a decent price, he probably just wants to go as cheap as possible, lol.
Don't worry... you can always turn the gain down!
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Old 6th April 2008, 03:51 PM   #2
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Join Date: Nov 2003
Location: Louisiana
Replace both transistors.


Check the bias for the repaired channel. Set it the same as the other channel. Do this after clamping the transistors to the sink.
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Old 6th April 2008, 03:54 PM   #3
ppia600 is offline ppia600  United States
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Join Date: Jun 2007
Location: Louis y ana
Thanks Perry, I remember seeing that thread. I just can't seem to get good search results here. All I end up with usually are home audio topics. I think I may already have two 530's also.
Don't worry... you can always turn the gain down!
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