This is the PCB of a tube buffer. The design have a reference to the popular and proven performance tube buffer X-10D. It can use many types of small signal tube like 6922, 6DJ8 and 6N11. The circuit use the tube in class A triode mode. The distortion has reached below 0.01% ( 1KHz), and frequency response from 10Hz to 100KHz, and output impedance down to 200ohm. The buffer section of the board is as shown in the picture below. The whole board includes the buffer and the power circuitry. When fully assembled. It only need a AC input of 12V, 500mA. We provide schematic and part list to buyers by EMAIL. PCB dimension: 20cm x 6cm. PCB thickness 1.6mm. Copper thickness : 70um( 4 times of normal thickness !). Surface is gold plated. We do air shipping worldwide at US$4.00. We welcome combine shipping. Track Page Views With Auctiva's FREE Counter Powered by SoldEazy