Note when placing an order: the power amplifier does not have a vacuum pipe mesh cover

Features:

Adopt high-quality wide frequency response and high sound quality EI output transformer Use EI power transformer specially designed for this machine

The front stage uses 12AX7 for voltage amplification, and the rear stage uses EL84 vacuum tube for Class A single-ended power amplification

Easy-to-install plug-in vacuum tube shield with headphone output.

Parameter:

Rated output power: 3W+3W

Frequency response of the whole machine: 10Hz ~ 50kHz (-1.5dB)

Harmonic Distortion: 1% (1kHz)

Signal-to-noise ratio: 87dB

Input Sensitivity: 210mV

Input Impedance: 100kΩ

Output impedance: 4Ω, 8Ω

Power supply voltage: ～220V±5% (50Hz)

Overall volume (W×D×H): ( 175 x 190 x 132 ) mm

Vacuum tube used: 12AX7×2, EL84 (Dawning×2

Net weight: 4.6 kg

Working conditions: Temperature: 0℃～40℃ Humidity: 20%～80% Power consumption of the whole machine: 45W

Storage conditions: Temperature: -20℃～70℃ Humidity: 20%～90%

Use range: 30Ω-600Ω headphones can be used, headphone jack 3.5mm

Small and exquisite Mini218 IA tube amplifier

This tube amplifier is designed with the concept of simplicity as the starting point. The circuit is very simple. It adopts 2-stage amplification. The front stage and the driving part are used 12AX7, while the power amplifier stage uses a 6BQ5 for single-ended amplification, and each channel outputs 3W. of power. Such a low-power tube amplifier can guarantee a sweet tone, but the premise is that it needs to be matched with a speaker with high sensitivity. In terms of function, the Mini218 IA is equally simple, with only 1 set of high-level input, 1 set of headphone output, and speaker cable interfaces with two different output impedances of 4Ω and 8Ω.

The front panel of Mini218 IA amplifier has headphone, speaker channel switch, and volume adjustment knob, which is very simple

The back of the amplifier is equipped with two different output impedance terminals, 4Ω and 8Ω, and a set of RCA interfaces. The craftsmanship and quality of these connectors are quite good.

Is 3W output power enough?

Speaking of this, some people may ask: "The output power of the current combined audio system is dozens of watts. Is the output power of 3W enough?" Enough! Because in actual use, the listening distance is basically within 1 meter. The sensitivity of the Helium 410 speaker reaches 87dB, that is to say, when the power amplifier outputs 1W of power, a sound pressure value of 87dB can be obtained within a distance of 1 meter. In actual listening, the sound pressure value usually rarely reaches 87dB. Therefore, although the actual output power of the power amplifier is not large, the output power of 3W is sufficient here.

As for how it sounds? When I listened to it, the volume knob was basically turned to about halfway, and the source of the program played was the high-speed Internet radio station in iTunes. At this time, the control of the power amplifier is very good, the sound is still very relaxed, and the image is very condensed. The outline of the instrument, whether it is a violin or a piano, is quite clear without appearing dull. So it can be inferred that the output power of 3W is actually enough.

Actual usage scenarios