Here is the pin out of the PAL006A audio chip used in the Pioneer amp. It appears to be the industry standard Felxiwatt 25 foot print. Pin 25 is usually a NC or an alarm pin or diag, I’m not sure what it is on the PAL006 or even if it is used in the factory amp. The next time I’m in the shop with nothing to do I’ll take a look at my amp. Compare it to TDA 7385, 85 or 86.

Jeff