The whole intent of these replacement modules are to get away from all that speculation and roulette game of swapping modules or trying to find 'good' STK's when according to sources more knowledgeable than myself, Sanyo hasn't produced STK's since the late 80's/early 90's. The NOS of these has pretty much been used up by the vintage repair market. Anything you find is likely a substandard knock off unless you pull it yourself from a working unmolested vintage unit. You can take your chances, or embark on a new course and build something solid.
Now there is some expense, and work involved, but in the end you get a discreet output stage for your unit made from robust modern components that has very low distortion, adjustable bias, excellent thermal capabilities, and is rebuildable.
It's likely these modules are too much effort for someone who is trying to run a paid repair on these units- and that was not the intention. It is more for those of a diy mindset who have a nice example of a unit that they are keen to repair and continue to enjoy into the future.
This is like an abreviated DIY amplifier project, only concentrated on the output stage of a popular unit- and adaptable to many more. You can order the pcb's and parts for yourself from the information RCS16 has generously posted. Once the PCB board and components are in hand, you have all the dimensional information needed to cut a heat spreader plate to suit particular requirements.
It's just another option, for those who may be fed up with the uncertainty or failure of available STK's, or just want to try something different.
