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HIFI Transistors Power Amplifier
IWISTAO Ultra Class A amplifier 2 X 80W Stereo Integrated Power and Headphone amplifier Whole Aluminum Casing Black HIFI Audio
Model No: WHFTA-HA2200
The circuit of ultra Class A amplifier is improved from the circuit of audio tech nica headphone amplifier, and added a power amplifier features into the unit, making it two-in-one "integrated a power amplifier and a headphone amp, which is practical and convenient. For those audiophile had a high-end headphone but want to own a power amplifier, you don’t need to buy another headphone amplifier, to buy this unit then you can own a high quality power amplifier and headphone amp with one-step process.
Circuit structure for a two-stage differential circuit, the input stage uses K170, behind the main amplifier transistors adopt Tosh iba A970 and C2240; Output transistors of power stage adapt dedicated audio transistors NJW0302 and 0281by ON Semiconductor on, pure tone, good penetration, quiescent current per transistor is 250MA. Plugged in any headphones, the headphone amplifier work in the class A state.
(The panel of the photo above only for you information)
All chassis with brushed surface coloring treatment, first-class technology, superior quality, all-aluminum volume knob, first-class hand feeling.
About Ultra Class A Amplifier
Class A amplifiers, whenever there is a fixed, guaranteed maximum undistorted output bias current.
Class AB has a larger bias current relative to the near-zero current state; under class A and B status, it work on the class A within a certain signal intensity, beyond the scope of signal intensity it work in the class B status.
Bias current of ultra class A amplifier always track the signal size to ensure that the signal is amplified work on the class A status, regardless of the size of this signal; and it is the amplifier with the advantages of no cut-off and close for class A amplifier, and efficiency of class B amplifier.
1. Headphone amplifier section: listen with headphones, high analytical, clear treble, saliva sound could be heard, squelch it almost inaudible;
2. Power amplifier section: drive a pair of ordinary speakers SO NY 8-inch, audition room space about 25 square meter, the effect is amazing, excellent performance of each frequency, low frequency not soft. It is a good partner room for the signal from of computer and a CD indoor.
1. Two-side 1.6mm thickness blue oil PCB.
2. 25A rectifier filter circuit plus 2pcs 10000Uf Leroy gold filter capacitor. Small capacitors used imported hifi capacitors, 5-rings high precision resistors, high quality assurance.
3. 125W copper wire toroidal transformer and import audio shielded cables, potentiometer adopted Japan ALPS16 type.
(The panel of the photo above only for you information)
4. UPC1237 comprehensive protection circuit with start delay, switches no impact, midpoint protecting your valuable headphones and speakers.
5. Improved amplifier circuit has been carefully added some useful features: dual relay design, as long as the headset is plugged in when using the headphone amplifier function, the power amplifier output will automatically disconnect and mute, so just it is a headphone amp, and unplug the headphone amplifier will resume speaker output, this feature is very useful and practical.
1. Output Power: 80W + 80W
2. Frequency Response: 20Hz ~ 20 KHz
3. SNR :> 90dB
4. Output Impedance: 4 ~ 8 ohm
5. Headphone amplifier power: 200mW / 300 ohm, 400mW / 60 ohms
6. Headphone amplifier output impedance: 30-300 ohm
7. Input voltage: AC 220V / 50Hz (110V available if you need, please leave a message)
8. Dimensions (W * D * H): 184mm * 301mm * 60mm
9. Weight: 4.5kg
Power cord x 1
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