LG105B 12AX7+12AU7 bi-level preamp two-channel amplifier board green board VQ version: imitating the British MATSSE Matisse line. Immersion gold high-quality PCB green board, double-sided solder mask, size 144×94mm, board thickness 2mm is not easy to deform, thick copper foil, one 12AX7 channel amplification, one 12AU7 output, 6.3V?0?6.3V filament Three taps on the center of the winding, high voltage 300V DC power supply. Carefully design the PCB wiring, the wiring is reasonable, one point is grounded, and the line is quiet.
LG105B finished board without VQ version
LG105BD finished board contains 2 imported second-hand tubes
Board code: LG-105B gold-plated board
The board has green and red, neither are selected!
Selected imported high-quality component assembly, high-quality ceramic silver plated base, imported famous second-hand high-quality electronic tube, imported and domestic 1~3W metal film, carbon film copper pin resistance, large resistance wattage margin. 22?450V axial electrolytic filter, the second-stage coupling uses American 0.22U400V VQ silver film capacitor, the third-stage coupling uses Swedish 1u400V MKP film capacitor, and the third-stage uses Swedish 420 1u400V film capacitor output. Although the filaments are all powered by AC, due to the reasonable wiring, the AC sound is very small, and it has a more daring charm and ten more guts. The circuit board can be installed in a sealed enclosure or exposed pipe installation.
The circuit is mature, excellent performance, reasonable wiring design, universal component size design, voltage and component parameters marked on the board, simple assembly, as long as the wiring is correct, it can be a one-time success, is a shortcut to success, suitable for DIY production.
Board features: double-sided gold-plated board, board thickness 2mm, 72 ?m thick copper foil. The filaments are all powered by 6.3V?0?6.3V (electronic tube filaments are connected in parallel, the center tap of the winding), or 12.6V DC power supply. The 9-foot tube base is designed for flat foot holes and round foot holes. The flat foot holes are suitable for general-purpose tube seats, and the round foot holes are suitable for CMC high-end Teflon tube seats or ceramic bakelite tube seats.
Declaration: Some components on the circuit board are second-hand disassembled products. Due to different assembly batches, the types, brands, models, and specifications of some components will be slightly different. The components and parameters assembled on the board will prevail !