Description

Note: When testing the machine, the speaker must be connected. No-load test is easy to burn the transformer or the electronic tube (the electronic tube will appear red). This kind of burning is not guaranteed by our shop.

The texture of the shipped chassis will not be the same as the texture of the picture, and the texture of each chassis will not be the same. The wood: Jintai teak logs.

【index parameter】

How it works: Stereo push-pull class A

Output power: >2*15W(RMS)

Frequency response (-2DB): 20HZ-28KHZ

Sensitivity: ≤1V

Distortion: ≤0.5% at 5W

Signal-to-noise ratio: ≥94DB

Power consumption: <150W

Output impedance: 4R 8R

The preamplifier of this machine adopts Beijing 6N3-J. Beijing 6N1 (imported model ECC85, 6AQ8) with stronger low frequency is used as the booster. The power amplifier stage uses the low-frequency power amplifier pentode 6P14, which has the reputation of "good quality and talent" in the audio industry. It is a kind of power amplifier tube with excellent performance, which is also confirmed by the actual installation and audition. The main advantage of the pentode is that the amplification factor is large, and when used as an amplifier, a higher amplification factor can be obtained. At the same time, due to the double shielding effect of the curtain grid and the suppression grid, its cross-circuit capacitance is very small, such as 6P14, which is less than 0.2pF, and the high frequency loss is small. Of course, when compared with triodes, when pentodes are used as amplifiers, the distortion and noise are larger. However, after the machine is installed, the sound is pure and natural, transparent and fast, and the noise is basically inaudible.

Notice to all buyers: The machines sold in this shop are all authentic pure tube amplifiers, and output transformer coupling is used between the electronic tube and the speaker. Experts all know that the reason why the tube amplifier has the taste of gall, the function of the output transformer is indispensable! It is not a fake tube amplifier that is not a front tube and a back stone machine or even an electronic tube is just a decoration! ! ! All transformers of this machine are produced by our factory, with good parameter consistency, and never cut corners.

【Tips for choosing a tube amplifier】

Look at the number of transformers installed on the machine: the authentic amplifier needs three transformers (the big one is the power transformer, and the two smaller ones are the output transformers), the power transformer of the machine (No.: 1055013) is 190W, and the iron core is 105*50. , No heat and no vibration, it is made of copper wire and annealed silicon steel sheet, and it is installed horizontally. It is a work of art without being covered by a cow cover. The output transformer (No. OP763506) is wound with 3 clips and 2 windings. The iron core is made of Z11 silicon steel sheet with a thickness of 0.35MM made in Japan, and the size is 76×35. The magnetic permeability of the Z11 sheet will be higher, and the low frequency will be lower. The effect is much better than the domestic H14, H18 silicon steel sheet. Because the transformer accounts for most of the cost of the machine, it needs special instructions. In addition, the inductance of the filter choke coil (I57X30) of this machine is 5H 0.2A, and the signal-to-noise ratio of the whole machine is relatively high. It is only after the speaker with a sensitivity of 92DB that I can hear a little bit of bottom noise!

【Material Description】

○This machine adopts the PCB board one-point grounding design, thick copper foil wiring, strong overcurrent capability, and almost inaudible noise floor.

○The coupling capacitor adopts SPRAGUE 0.1UF, and the filter capacitor adopts Korea SAMYOUNG high-quality high-frequency low-resistance electrolysis.

○The resistors use copper pin metal film resistors and metal oxide film resistors, and high-power resistors use aluminum shell resistors.

○The potentiometer is ALPS 16 type A100K

○The tube base is ceramic silver-plated, and the valve models are four Shanghai 6P14-J, two Beijing 6N1-J, one Beijing 6N3-J, and one Shuguang 5Z3PA rectifier tube.

○The power supply adopts bridge stack rectification, and then uses 5Z3PA electronic tube as buffer, which not only obtains a large current, but also protects all other electronic tubes because of the use of rectifier bile buffer.

○Pure handmade, ash log chassis, the wood is dried, polished and painted, with rich texture, simple and beautiful! The upper top plate is a 1.5MM varnished iron plate, and the lower bottom plate is a 1MM thick punched varnished mesh plate. The advantage of using a metal top and bottom plate is that it can isolate some clutter interference!

○ Moderate size (30cm wide, 25cm deep, 18cm high). Flat scale size, solid and steady (9.5KG), restrained atmosphere! Ideal for use as desktop or home audio.

○Because of the special large inductance output, the iron core size is 76*35, and the low frequency can be as low as 20HZ, so not only listening to human voices, but also large dynamic symphony can be fully competent, and the effect is not better than 1969 Xiaojia or TDA7294, LM3886 Poor amplifier.

○The rated output power of this machine: 15w+15w (because the electronic tube has the advantage of strong overload capacity, the actual undistorted output power is equivalent to the 80w+80w transistor power amplifier!)

○This machine has two impedance output modes of 4 ohms and 8 ohms. This machine is suitable for small bookshelf speakers with high sensitivity (above 88DB). The full-range paper plate speaker speakers do have a different charm when listening to human voices. Since the tubes at all levels work in the state of Class A amplification, the distortion is small, the sound is sweet and soft, and the hearing resistance is extremely high!

【Internal circuit board diagram】