IWISTAO Power Amplifier 2x25W ClassA FET Single-ended Stereo Whole Aluminum Casing

100 In stock

HIFI Transistors Power Amplifier

  IWISTAO HIFI Amplifier 2x25W ClassA FET Single-ended Stereo Power Amp Whole Aluminum Casing Design With upc1237 Protection Black   Model No: WHFTA-PassGold   It is a pure class A single-ended stereo power amplifier, which is a very high degree of completion HIFI amplifier, its sound is silky smoothness, also it...

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IWISTAO HIFI Amplifier 2x25W ClassA FET Single-ended Stereo Power Amp Whole Aluminum Casing Design With upc1237 Protection Black


Model No: WHFTA-PassGold


It is a pure class A single-ended stereo power amplifier, which is a very high degree of completion HIFI amplifier, its sound is silky smoothness, also it is too appealing when you listen to the sound of strings and human voice with the unit, and this is definitely a warm sound amplifier, but unlike a little dim sound of tube amp, its sound is warm and detailed, while low dive control and damping is also very perfect.


IWISTAO Power Amplifier 2x25W ClassA FET Single-ended Stereo from IWISTAO HIFI AUDIO on Vimeo.


As its 25W output power at  20 to 30 square meters or below space, both with book shelf speakers or floor speakers, it will have a good performance. Remarkably, its signal to noise ratio control very well, you will hardly hear a little noise when you put your ear to the speaker at deep night, although its power is increased to maximum, but the circuit design more rational, so it is still have higher SNR.







1. Basic faithful to the classic PassA30 circuit, which, with respect to the sale of several million PassA5, merely reduces the output power, its structure is completely different, showing the maturity of its circuit!

2. 350W power supply high-quality Toroidal Transformer, using 4 pieces HIFI RM 15000uf filter capacitors as CRC, total filtering capacity is 120000uf.

3. The most important is to add upc1237 speaker protection system, switch absolutely no impact sound while performing midpoint of DC protection, to prevent damage and burn your expensive speakers due to the amplifier circuit.

4. Three pairs of matched large power FET tubes expansion flow in parallel, to ensure the driving force.

5. Add a midpoint trimming circuit at differential input, which can correct the problem of midpoint offsetting at some extent.

6. The finished unit with about 4KG heat sink, while it is whole aluminum design, this benefit other parts of the casing become heat sink also in addition, so that the total heat dissipation area greatly increased.

7. Combined APLS 27   potentiometer into the amplifier  

8. Adopted 4 channels signal inputs, you can select the input from the knob on the front panel.










1.    Maximum undistorted output power: 2 x 25W (at 1KHz continuous power without distortion).

2.    Frequency Response: 20Hz - 20Khz

3.    Distortion: <0.01% (1KHz sine wave output 20W)

4.    Input sensitivity: <500mv.

5.    Output Impedance: 4 - 16 ohms

6.    Amplifier voltage gain: 30 times.

7.    SNR:> 103dB

8.    Working voltage: AC110V or 220V / 50Hz

9.    Maximum power consumption: <180W

10. Size (W * H * D): 284mm * 80mm * 308mm

11. Weight: 10.5Kg

12. Color: Black

13. Accessories

Power cord x 1



For the 110V version, the lead time is 10 business days. please note if you want to buy this version.  

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