Details：
Ground Grid gg Stereo Tube preamplifier kit
Works voltage: +DC200V 0 -DC200V and + DC12V
PCB Size: 132X132mm
thickness: 1.5mm
copper thickness 50um.
This board is use 3pcs 12AU7 tubes.
（note: this link default price is not include the tubes)
Note：
Bare pcb：just 1pcs pcb，have not any parts
Diy kit：all parts need buyer to solder，not included 3pcs tubes
Assembled board：have tested well，not included 3pcs tubes
Suitable power supply board link:
https://brz-hifi-audio.com/products/gg-psu-ground-grid-tube-preamplifier-double-high-voltage-power-supply-board?VariantsId=14198
Purchase link for matching transformer:
https://brz-hifi-audio.com/products/30w-pure-copper-r-type-transformer-output-0-220v-0-14v-for-tube-preamp
The following is a wiring diagram for reference only
