This DIY KIT,you need solder the parts by yourself,like the picture not include the tube.
The output voltage of this power supply has a wide adjustment range, excellent voltage regulation performance, low output ripple, and the output can be adjusted to suit different tube preamp.
Regulator D3 can be selected from a wide range of voltage regulator diodes can choose 10 ~ 20V/1W. But it should be noted that when the selected voltage regulator is below 14V, R5 should be changed from 12K to 8.2K. Adjust the 50K trimmer potentiometer to meet the voltage you need.
PCB specification: 55*98MM
Note :
Look the picture 1
Note 2