Disclaimer: Working with voltages above 800V, as found in 845 amplifiers, is lethal. This article is for informational purposes regarding vintage topology. Do not open or modify a Xin Zhi Zhao amplifier unless you are a qualified technician.
If you manage to locate an original PDF of the schematic, pay close attention to the (usually a 47k anode resistor on the 845's plate for the driver). Replicate that, and you will have an amplifier that sings for decades. Without it, you just have a hot chassis. xin zhi zhao schematic top
In the esoteric world of high-end vacuum tube audio, few names command as much respect among DIY builders and collectors as Xin Zhi Zhao (often abbreviated as XZZ or New Journey Audio ). While the original Xi’an-based manufacturer ceased mass production years ago, their "Xin Zhi Zhao 845" monoblocks and integrated amplifiers remain highly sought after. For the modern restorer or the ambitious DIY builder, the phrase "Xin Zhi Zhao schematic top" has become the holy grail of search queries. Disclaimer: Working with voltages above 800V, as found