I have a Pioneer car stereo. No sound out of the speakers. After google searches on my problem, I leaned toward the possibley it was the audio amp. So, I took the thing apart and got the amp part number. Ordered the part. The only difference in the amps were the markings on the amp. Yeh part numbers were the same. PAL007A. The old one had a small 0.4 inprinted on the lower right conrner. The new amp had a 0.8 in the same location. I went ahead with the replacement. I hooked the radio up with my 12 volt converter and a speaker. The speakers worked , which befroe did no. ?The only thing now is my 12v converter circuit breaker pops when I turn up the volume. I can feel the amp get hot on volume increase. Wondering if someone might know what the 0.4 or 0.8 means and if it's significant. The MOSFET part number is PAL007a. Any help is appreciated.