Description

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. ◆ Adopt all-aluminum double heat sink chassis, Class A power amplifier needs enough heat sink. The appearance is also very beautiful. ◆ Customized 400W OFC pure copper transformer with iron core imported from Japan with shielding iron cover. Low noise. ◆ 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. ◆ PCF F7 all use original Panasonic resistors and DALE CW-5 high-power wirewound resistors. ◆ 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. ◆ 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.