Description

Details： PCB size: 155x177x1.6MM FR4 A grade sheet Work voltage: [email protected] + [email protected] Tube model:use 4pcs 12AT7 or ECC81 Output stage: The SRPP method is adopted, but the difference of this SRPP method is that there is no cathode resistance between the cathode of the upper tube and the anode of the lower tube. Different from general voltage amplification, the third-stage SRPP output stage does not have any voltage amplification effect. It is only used as a buffer stage to reduce the output impedance and increase the output current, but it can drive a stronger load than a normal cathode follower. The overall dynamic and high-frequency response are slightly better than M-7, and its analytical power and signal-to-noise ratio are higher. The design of PRT10A is loyal to the original amplifier circuit parameters without any adjustments; we have improved the power supply: High-voltage power supply: use a regulated power supply, and use MOS tubes as voltage regulators to make it more daring. Filament: One input and two output two sets of voltage stabilizers, which supply power to the left and right channel electron tubes respectively. 30 seconds delay to turn on the output Note： This is a diy preamplifier pcb ，have no any parts ！ Transformer ：https://www.ebay.com/itm/353283816611 Tube ：https://www.ebay.com/itm/353491044405 Assembled board ，just for reference：