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HPA-5000 XL The HPA- 5000 XL is Allnic Audio??s Output Transformer Less (OTL) and Output Capacitor Less (OCL) stereo headphone amplifier. The HPA- 5000 XL utilizes a true balanced Positive-Negative cancellation circuit. The HPA- 5000 XL has a voltage gain of +28dB, and a maximum output of 5 watts. It works best with headphones having an impedance of from 30 to 600 ohms. The HPA- 5000 XL has the following features: ? High-quality, NOS tubes ? True OTL/OCL design ? Pure Class A operation ? Precision 41-step single silver contact attenuator volume control. The HPA-5000 XL does not employ a digital IC volume control or a low-cost carbon film volume control. The HPA-5000 XL has no (± 0db) channel unbalance at any volume level. ? New vacuum tube damping technology ?? Allnic Audio??s patented ??Absorb GEL tube damper? technology prevents harmful vibrations from reaching the driver tubes and, therefore, prevents micro-phonic noise propagation in the tubes. The Allnic Audio Absorb Gel damper technology effectively solves a problem that plagues most tube amplification systems. Provided other tube components do not introduce micro-phonic noise into your system, with the Absorb Gel damping system, you will enjoy a degree of transparent sound that will surprise and please you. ? As are all Allnic Audio products, the HPA-5000 XL is fully RoHS (EU Reduction of Hazardous Substances regulation) compliant in construction and material. Specification ? Inputs: one RCA (1), one XLR balanced (1) ? Headphone Output: one (1) one-quarter inch (1/4?), four-pin XLR balanced (1) ? Frequency Response: 20Hz ~ 20KHz (flat) ? Voltage Gain: +28dB ? Optimum Headphone Impedance: Thirty (30) to Six hundred (600) ohms ? Output Wattage: Five (5) watts ? Maximum Input Voltage: Five (5) volts RMS ? THD(Total Harmonic Distortion): Less than 0.03% (1KHz, output 1V) ? S/ N Ratio: -68db (CCIR, 1KHz) ? Power Consumption: 70 Watts ? Tubes: 1 x 6AN8 (New Old Stock, first gain stage, no equivalents) 2 x E180CC (New Old Stock, Second gain stage, approximately electrically (not sonically) equivalent: CV8431, 7062, 5965, 12AV7, 6414, 6829) 4 x 7233 (New Old Stock) ? Fuse: AC 2A, 250V ? Dimensions: 230mm (~9.1 inches) x 380mm(~12.3 inches) x 165mm (~6.5in ches) (W x D x H) ? Weight: Unpacked: 9 kg (~19.9 lbs) Packaged: 11 kg (~24.26 lb) HPA-5000 XL Fullrange(S.Korea??s webzine) review HPA-5000 review