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http://www.dx.com/p/yj006-portable-headphone-amplifier-black-156069#.VUAQviHtmko

Introduction
Amp original Toshiba BD139 BD140 tube output, the CPI amplification NE5534 dual op amp integrated circuits with resistive and capacitive original thick sound of the end of the sound field broad, clear, soft voice, sweet, warm, natural. The amp direct drive 32-ohm headphones, can achieve good results


Product Details
1.         The original Toshiba BD139 BD140 and NE5534;
2.         Front input capacitance and the inter-stage coupling capacitor Siemens capacitance 1UF the main circuit of the signal of the electrolytic capacitors Philips BC brand names, the main filter capacitor using the capacity of 2 × 2200UF to ensure a strong and steady stream of power support;
3.         The resistance selection of the five rings of metal resistance, the main circuit with accuracy ± 1% of the five rings of metal film resistors to ensure that the machine a good signal to noise ratio;
4.         PCB with 1.6mm thick double-sided sheet, 2.0 oz copper thickness, HASL process to ensure that the size of the current good performance, superior quality of the PCB!
5.         The layout of the alignment of the entire circuit board is very strict and reasonable, the overall PCB traces with little grounding method. Set out in the dead of night when the headset is almost not hear the noise floor, very quiet.
6.         Board size: 140 × 76mm
7.         Operating voltage: AC 15V-0-15V
8.         Applicable Headphone Impedance: 32 ohm ~ 600 ohm
9.         Frequency response: 20 ~ 20KHz
10.       Operating Current: 0.8A

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