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Details：

PCB Size: 155X122MM

works voltage: 0-AC220V (this voltage 200-260V are all ok)（above 30mA)

0-AC6.3V (1.5A)

0-AC10V （1.5A）

using tube: 2pcs 6Z4 2pcs 12AU7 and 2pcs 12AX7

Frequency response: 20HZ-30KHZ

Input sensitivity: 300MV

Signal to noise ratio: 98DB