Up for sale here is this brand new bare board with all necessary parts to build a replacement for the PA3004 IC chip. This chip frequently goes bad in vintage Pioneers such as the SX-780, SX-880, SX-980, SX-1280, and the SA-7700.  The chip has been discontinued for decades, and is impossible to find, but luckily some fine folks on Audiokarma designed a replacement for it.  This is larger than the original chip--the board measures 30mm x 40mm.  Still, it should fit just fine in most instances, though it will probably not fit in the SX-780 and you will probably want to use the smaller SMD version.  

I have shown a picture of what this looks like once it's assembled, but this listing is just for the bare board and the parts to build your own.

Installation is fairly easy--you will need a soldering iron, solder, and wire cutters.  The board is marked with part numbers.  The resistors you receive will not be marked, so you'll need to either read them or test them with a multimeter. 

If this seems too complicated, you can buy a completely built PA3004 replacement here.  If you just want to buy a bare board, that is available here.

Here are the instructions for assembly:

Part                                                         Location

Small blue capacitor          C1

1N4148 diode x4 (no paper bits)             D1-D4

1N5236B Zener (paper bits) D5

KSC1845FTA x6                         Q1/Q2/Q4/Q5/Q6/Q9

KSC2383YTA                         Q8

KSA992FTA x2                 Q3/Q7

100k ohm resistor x6                               R1/R2/R3/R4/R5/R6

75k ohm resistor                                      R7

100 ohm resistor                                      R8

150k ohm resistor                                    R9

1.3k ohm resistor                                     R10

Molex connector                                      Bottom

US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.