12AX7 / 21AU7 Tube Preamplifier Preamp Board DIY Kits Classic Circuit

• This is DIY Kits, Need welding its by yourself!
  Not included 12AX7/21AU7 Tube!!
  Power Supply: DC 180-300V+DC 12V
  Using double-sided immersion gold processes gold-plated circuit board!
  Taiwan produced copper foot precision metal film resistors!
  Siemens high-voltage filter capacitor!
  Ceramic Gold-plated tube socket to ensure contact reliability!
  
  

• Package Contents
  100% Brand New
  1set*Tube Preamplifier Preamp Board DIY Kits
  (not included 12AX7/21AU7 Tube!!)

the new version is black PCB ，


not include the tubes， just for shown ，thanks