Features: Black aluminum chassis with arylic transformer cover Use of all DC filament for lighting, there was not a little hum noise when use the102DB headphones to listen Using FU32 tube amplify the input signal to higher voltage output. and the OP chip amplify the current output to headphone Taiwan made A50K type potentiometer, ensure clear positioning and sound's balance Using a precision of up to 1% metal film resistors High level original Rubycon,Nichicon capacitors, Gold-plated RCA Prefect match with Sennheiser headphones, such as HD600, HD650, HD700 and other professional headphones Specifications: Tube: FU32×1 Input: 3.5mm Jacks, Stereo L/R RCA jacks Input Impedance: 20K ohms Input Sensitivity: 800mV Output: 3.5mm Headphone Output Impedance: 12 to 300 ohm Output voltage: 24Vp-p Frequency Response: 30-30Khz (±1db) Power Consumption: 35W Input AC Voltage: 110~120V AC Dimensions: 168 * 115 * 33 mm / 6.61 * 4.53 * 1.30 in Net Weight: 1.6 Kg / 3.53 lb Package Includes: 1× Headphone amplifier 1× FU32 tube 1× Power cable 1× 3.5mm audio cable (Lenghth: 15cm)
T**P
Cool pentode, bro (updated)
Update: It took a LONG time for this to break-in. It took months before the tube gave me decent power without distortion. The amp puts some mojo on the sound (translation: it colors the sound), but it sounds great. Especially with dialog in movies, it make everything so much clearer and a little more dramatic.The downside: Friggin' grounding issues and noise. Ugh! So close to a great character amp. If only...Neat design with good quality components. Even if I bought this direct from China as a kit, it's still cheaper to buy from Nobsound domestically. The sound quality is okay. Even with a little distortion I can still listen for hours without wanting to rip off my headphones and throw them. My unit appears to have some grounding problems, as well.Allegedly the final output stage is a high-quality op-amp. (A TI NE5532? I didn't check.) It really struggles to push enough current to drive my 55 ohm headphones. (I mean, without distortion.) Op-amps are cheap. A pair would probably be better. Just my opinion, but a $100 headphone amp really should be able to drive a 600 ohm set of cans beyond a gnat-sneeze level of sound.However, overall I don't regret this purchase.
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