Little bear P5-1 BLUE tube valve puffer Preamp Preamplifier amplifier ver1.2 1 x Solder finished preamp board 2 x Peking 6J1 tube 6 x Panel(assemble to a box),4x screws 1 x Transformer 110V or 220V,output AC:12V/1A,(i will sent correct model to you by your address(country),with EU/UK/US/AU plug for choice) PCB Circuit layout is reasonable and beautiful, minimize noise,warm sound,perfact for listen person singing. ,Best for your desk headphone amplifier or home power amplifier.make the sound more warm. About the input and output interface.all using GOLD RCA interface PCB. Using E-package USPS post shipping to USA. usually 7-10 business days arrival