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![](https://ae01.alicdn.com/kf/Se5102935bb8c4bacab6f67298be82c013/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg) ![](https://ae01.alicdn.com/kf/Sa3eb4398d6ca4545a65fd908c6efd8c8j/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg) ![](https://ae01.alicdn.com/kf/S97262858cc234b90828a4b8817c2e3ddH/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg) ![](https://ae01.alicdn.com/kf/Se0a1ef259fa14be8a2c003dee757b02ea/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg) aHR0cDovL2ZyZWVzaGlwLmNvLmty![](https://ae01.alicdn.com/kf/Se5102935bb8c4bacab6f67298be82c013/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg) ![](https://ae01.alicdn.com/kf/Sa3eb4398d6ca4545a65fd908c6efd8c8j/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg) ![](https://ae01.alicdn.com/kf/S97262858cc234b90828a4b8817c2e3ddH/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg) ![](https://ae01.alicdn.com/kf/Se0a1ef259fa14be8a2c003dee757b02ea/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg) ![](https://ae01.alicdn.com/kf/S2b2fc26826ba48ac90b7faeeda22f13bi/High-quality-All-germanium-tube-XLA-pre-amplifier-finished-machine-XLA-Input-XLA-output-Triple-signal.jpg)
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Full-germanium tube full-balanced direct-coupled single-ended Class A low-distortion dual-channel pre-amplifier, triple signal amplification, balanced input and balanced output, full of charm.Powerful sound effect full germanium tube low distortion direct-coupled dual-channel balanced preamplifier board, full discrete components, three times signal amplification, full of resemblance, can make your system bring some sweetness and soften the sound bottom Flexible and thick. Direct-coupled amplifier circuit, low distortion and low internal resistance, the pinnacle of the germanium tube era, used in conjunction with post-amplifier speakers.Class A single-ended sound is noble and charming, even harmonics are rich in the ears, there is a strong musical taste, the sound is warm and soft, and the overall listening feeling is relaxing and pleasant.CD players, decoders and other audio sources use balanced pre-amplifiers and work with 220V.The usage method is as follows: CD sound source balanced output ---> all germanium tube direct-coupled balanced amplifier (that is, this unit) ---> balanced input power amplifier ---> speaker speaker.The schematic diagram is as follows, and part of the balanced line is for reference only:
![](https://ae01.alicdn.com/kf/H1faf192672a64384a7ab53862dfb6160p.png)
The circuit uses 12 germanium transistors for DC amplification and output. The 1.5V output signal voltage of CD, decoder, etc. can be amplified by the circuit board to three times the signal and 4.5V balanced output. The front stage is equipped with an AC/DC feedback bias circuit, and the second stage has an AC/DC negative feedback from the emitter to the base of the first pole. The third-stage emitter output serves as a buffer and can be output with low impedance. Therefore, the matching of the amplifier board and the post-stage power amplifier has a good effect.This direct-coupled germanium tube balanced amplifier is one of the outstanding masterpieces of the germanium tube era. It has a unique style with high fidelity and unique charm. It can be used in conjunction with modern digital sound generators. It is a perfect match. Whoever listens to knows.Material: Imported tonic components for double-sided PCB circuit board assembly. KA7915 three-terminal, HA179L12 three-terminal. Japanese "KOA" five-ring high-precision resistors, Japanese ELNA gold tonic capacitors, ELNA purple robe blue shell capacitors, Japanese Sanyo or domestic brand new tubes are precisely matched, and the magnification and characteristic curves are uniform and straight. 24-step stepping balance volume potentiometer. American CMC thick gold-plated socket. Aluminum alloy knobs and aluminum alloy feet. Heavy iron chassis.Circuit board work flow: 220V city power is output by power transformer 15V rectification filter 20VDC, LM7915 three-terminal voltage stabilization, -15V power supply, and then the left and right channel HA179L12 three terminals each have a secondary voltage stabilization. The line has strengthened filtering and decoupling, and the wiring is reasonable, and the sound bottom is quiet and no humming.Sound characteristics: bass is thick, soft and flexible, mid-frequency is full and moist, and high-frequency is slender and silky, rich in color.
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