Why closed kits?
Since January 2014, all my constructions do not show crossover
components' values. The only way to get the full schematics is by buying
the kit from Jantzen Audio.
The reason for this is simple: Quite a few "creative" dealers in New
Zealand, Eastern Europe, Russia, Spain and a few other places had
started copying images, drawings and schematics from my website to their
own website and selling kits based on my constructions. This without
asking permission to copy files or suggesting any kind of royalties from
Thus, with each kit a Kit Instruction is added with the full schematics. And remember, you can buy kits with/without accessories and you can ask for coils being other than those shown on images, e.g. you want a wire coil replaced by foil coil or caps replaced by cheaper or more expensive types. And again: Schematics alone cannot be bought.