TAG-101 sine wave generator

I found the picture of the oscillator inside! Unfortunately is a discrete transistor! No way to improve the performance I think! ?????: eBay?????

So I think that the only chance is the DIY, do you know if I can buy the PCB of project already done from someone? I don't want to start from a schematics. Many thanks

It looks pretty simple, but you'd need the schematic to do anything with it.