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eBay Introduction: FirstWatt F7 is a very good small class A amplifier, with almost no advantage of feedback brute force. It resorts to a strategy that makes the dance a bit more like tango. Appropriate amount of negative feedback and positive current feedback form a balanced impedance close to zero in the output, which improves the transient response and frequency response. Of course, you can achieve a similar effect by using a lot of negative feedback, but I think this is more elegant and sounds better! For the sake of brevity, I will call it “PCF”. We used more filter capacitors in the power supply and found a clever way to further reduce the effects of high frequency DAC noise and ambient RF. FirstWatt F7 This is a different amp. Variety of audio tastes, not everyone will like it. I think some audiophiles will like it. â—† Adopt all-aluminum double heat sink chassis, Class A power amplifier needs enough heat sink. The appearance is also very beautiful. â—† Customized 400W OFC pure copper transformer with iron core imported from Japan with shielding iron cover. Low noise. â—† The power board adopts Schottky 30CPQ150 as CRC fast rectifier, which is the favorite rectifier tube of Class A amplifier. It uses Nichicon 22000uF X 16 PCS large audio filter capacitor, and the powerful filtering power brings you a different enjoyment of listening to music. â—† PCF F7 all use original Panasonic resistors and DALE CW-5 high-power wirewound resistors. â—† According to the circuit characteristics, K170 and J74 input tubes are precisely matched, and the output MOSFET power tubes are EXICON ECX10N20/ECX10P20. (Old audiophiles know that EXICON MOSFET ECX10N20/ECX10P20 is often used in HI-END luxury amplifiers, and it also improves the sound Best MOSFET. The price is also relatively very expensive). But it is expensive for a reason. â—† With SPK protection function to protect your speakers. Adopt CANARE signal input wire, output use UK PRYSMIAN pure copper wire. Actual listening experience: Its music performance is very good. Compared with the 2SK1058 / 2SJ162 version, it is more inclined to play low frequencies. The high-middle bass layering is very obvious. Damping and actuation are great! (you need to use a preamp). Input voltage: AC 115V or 230V ((Optional)) Input impedance: 10K ohm Output power: 20W + 20W Gain: 14.5dB Input voltage at maximum output: 2.7V Frequency response:-3 dB 100 KHz Power consumption: 175W MOSFET tube: ECX10N20 / ECX10P20 Size: 430mm*137mm*440mm (W*H*D) Weight: 16.5KG Package includes: FirstWatt PASS PCF F7 ECX10N20 / ECX10P20 Class A power amplifier X1 NOTE: We do not provide any cables.
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