I didnt list the model number because I honestly dot know exactly what this amp is. I worked on a Punch 75 before this, and this amp basically has twice of the same type of outputs; possibly making this amp a Punch 150 (75wRMS x 2 I guess). The front cover says Punch 401s; 1200Watts. There are no details on the back cover, and the crossover is switch/knob style; where some of the earlier Rockfords used cards.
Needless to say, someone probably thought this amp was actually 1200w and ended up blowing one of the channels out. Someone before me clipped off the emitter resistors. I went ahead and removed the output transistors out of the circuit due to them being shorted and still soldered in. The serviving channel still works and does not need service. The power supply of this amp is also still in decent shape.
Digikey has the IRF540 and IRF9540 transistors, but they do not have the 0.10 ohm 3w resistors. Mouser sells them for $1 a pop and they are 1% tollerance. I have some 0.22 ohm 3w resistors in my possession - can I use 0.22 instead of 0.10 for this amp? Whats the limitation of these 0.22 ohm resistors as emmiters? I have a lot of them...
The largest caps in the amp (4700uF, 50v) are puffed out on top like I've not seem before. I'll need to replace these... Is there a good part number for caps like these?
Needless to say, someone probably thought this amp was actually 1200w and ended up blowing one of the channels out. Someone before me clipped off the emitter resistors. I went ahead and removed the output transistors out of the circuit due to them being shorted and still soldered in. The serviving channel still works and does not need service. The power supply of this amp is also still in decent shape.
Digikey has the IRF540 and IRF9540 transistors, but they do not have the 0.10 ohm 3w resistors. Mouser sells them for $1 a pop and they are 1% tollerance. I have some 0.22 ohm 3w resistors in my possession - can I use 0.22 instead of 0.10 for this amp? Whats the limitation of these 0.22 ohm resistors as emmiters? I have a lot of them...
The largest caps in the amp (4700uF, 50v) are puffed out on top like I've not seem before. I'll need to replace these... Is there a good part number for caps like these?

