Bazooka and exploding fet caper ?

romeoklr · 17th February 2006, 08:13 PM

Hi all

I need a little help, I have several Bazooka RSA75.2HC amps. They all have the same problem, blown fets... replaced the fets, tested the rectifiers, removed the outputs. trying to isolate the problem. Amp turns on and pegs the amp needle, tested gate resistors .. What gives ? Can I have a B/O tl 494. I do not have access to a O scope at the moment, is there anyway to test the IC w/o an Oscope ? Any input will be greatly appreciated.

Thanks Guys !

Perry Babin · 17th February 2006, 09:45 PM

Unsolder and resolder the connection on the ends of R42 on both sides of the board. Do the same on D6.

Check the driver transistors Q7 and Q8.

All connections like those on R42, D6 and R6? (can't read the second digit) need to be unsoldered and resoldered on both sides of the boards. This is a significant problem with this type of design.

swordfish689 · 19th February 2006, 06:20 PM

Yes they have very bad soldering. I had 2 of these amps and i had the worst time trying to figure out why the power supply fets were always shorting. And my probelms were the driver transistors. I had to resolder them and it worked great.

17th February 2006, 08:13 PM	#1
romeoklr diyAudio Member Join Date: Feb 2006 Location: California	Bazooka and exploding fet caper ? Hi all I need a little help, I have several Bazooka RSA75.2HC amps. They all have the same problem, blown fets... replaced the fets, tested the rectifiers, removed the outputs. trying to isolate the problem. Amp turns on and pegs the amp needle, tested gate resistors .. What gives ? Can I have a B/O tl 494. I do not have access to a O scope at the moment, is there anyway to test the IC w/o an Oscope ? Any input will be greatly appreciated. Thanks Guys !

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19th February 2006, 06:20 PM	#3
swordfish689 diyAudio Member Join Date: Jan 2005 Location: The Great Lakes	Yes they have very bad soldering. I had 2 of these amps and i had the worst time trying to figure out why the power supply fets were always shorting. And my probelms were the driver transistors. I had to resolder them and it worked great.