Description

Details： ZERO-ZONE PRT-12A preamplifier reference - American Gary CARY-SLP90 circuit, the circuit sound with High details, medium and low frequency very thickness. PRT12A uses one-point grounding, quiet back without noise High-voltage power supply uses Toshiba K2700 FET as a high-voltage power supply adjustment Transistor. The filament power supply uses a single-input and double-out voltage regulation mode to supply power to the left and right channels respectively. High-voltage filtering uses Hitachi electrolytic capacitors, chemical high-voltage decoupling capacitors, Taiwan's 3W 1% precision metal film resistors, silver-plated ceramic tube holders, SPRAGUE and MKP coupling capacitors, and has a good price/performance ratio. PCB size: 155x177x1.6MM FR4 Work voltage: 0-220V AC >=30mA (200-220V are all ok) 0-14V >=0.8A (AC12-AC15V are all ok) Tube model：4pcs 12AU7 tubes （default price not included tubes） Note： Diy Kit：all parts need buyer to solder it ！（not included 4pcs tubes） Assembled Board：have tested it well ！（not included 4pcs tubes） Transformer ：https://www.ebay.com/itm/165027667186