Cayin Spark A-845Pro 25th Anniversary Edition Single-ended Class A Tube Amplifier Amplifier
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As a product developed by condensing 25 years of experience, A-845Pro has made innovative designs from the outside to the inside. For example, the overall appearance is designed in black, and the color of stainless steel and titanium plating is used to bring calm and deep but yet Textured temperament. At the front of the center of the base, the designer introduced the architectural design elements of the palace. The A-845Pro's input function switching and negative feedback status display. The "Roman column" surrounding the half circle of the BIAS display table will be used. Lighted up one by one to show the working status of the whole machine, showing a brilliant form. Even input switching, NFB (negative feedback) and BIAS bias adjustment switching use gold-plated toggle switches to pursue perfect unity in every detail. In addition to proper innovation, some of Cayin's design elements still maintain the classic heritage, such as retaining the family-style master volume knob, so that the overall control is still intuitive. The arrangement of the terminal blocks on the back panel is not much different from the traditional product design of the factory. It still provides 3 sets of RCA high-level inputs and a set of Pre in front-level inputs, which means that A-845Pro is not only a A complete integrated power amplifier can also bypass the sound control for pure post-level use. The speaker terminal provides 4/6/8 ohm output load impedance matching options. The terminals used are all produced by domestic professional manufacturers.
The huge volume knob, above which are 4 function levers, as well as the classical "Roman column" shape status indicator light. Each "Roman column" indicates a different working state, including input source and depth of negative feedback.
The terminals are all high-quality products
The voltage amplification stage adopts Tung-Sol 6SN7GTB vacuum tube
As an anniversary limited edition model, Spark ’s tradition is to use everything in tube selection, and the A-845Pro is no exception. The first is that the voltage amplifier stage after signal input adopts the re-engraved Tung-Sol 6SN7GTB vacuum tube, and the promotion amplifier stage adopts Tianjin Full Music Quanzhen latest ceramic gold foot screen 300B / n vacuum tube, and the power amplifier stage adopts Full music graphite graphite screen electrode 845SL vacuum tube is used for single-tube single-end Class A amplification. The 300B / n anode adopts the global patent technology 1540 DIP fine mesh screen, which is matched with the graphite screen Full music 845SL to form a high, medium and low full band tone response. The 845SL adopts a new filament design, which reduces the size and space compared to previous products. The filament current is reduced to 0.6A, thereby saving 82%, the filament temperature is reduced by 70%, and the outer glass bulb temperature is reduced by 150 degrees, which can avoid extremely high filament temperature Distortion caused by grid thermal radiation. At the same time, A-845Pro is also the first amplifier to use Full music graphite screen 845SL vacuum tube. The high-voltage rectification of the power supply part uses Czech JJ 5U4GB rectifier to supply power to the driving stage and voltage amplification stage. At the same time, A-845Pro also uses German MUNDORF Mcap EVO SilverGold high-end coupling capacitors, the whole machine uses Teflon silver-plated electronic wire manual scaffolding manufacturing process, configure NFB. Negative feedback selection, power failure memory function, high voltage delay function, external Set 845 vacuum tube current adjustment (BIAS ADJUSTMENT), external hum adjustment (HUM BALANCE), external (BIAS) monitoring table and other functions. The whole machine is made by Cayin's traditional manual scaffolding, and details such as paint treatment, wiring layout, connecting solder joints and screw torque are precisely controlled.
High voltage rectification adopts Czech JJ 5U4GB rectifier tube for power supply
Promote the use of Full music ceramic gold foot screen 300B / n vacuum tube
The power amplifier stage uses Full music 845SL vacuum tube as a single-tube single-end Class A amplifier
The whole machine adopts Teflon silver-plated electronic wire manual scaffolding production process
Using German MUNDORF Mcap EVO SilverGold high-end coupling capacitor
Volume control adopts Japanese ALPS motor drive potentiometer products
Cayin A-845Pro basic parameters
Output power: 25W + 25W
Frequency response of the whole machine: 10Hz-26kHz (-3dB)
Harmonic distortion: 0.3% (1W / 1kHz; 5% at rated power)
Signal to noise ratio: 90dB
Input sensitivity: 300mV (when combined input), 1300mV (when pure final input)
Input impedance: 100kΩ
Output impedance: 4Ω, 6Ω, 8Ω
Vacuum tube: 6SN7GTBx2, 5U4GBx1, 300B / nx2, 845SLx2
Power consumption: 380W
Input terminals: three sets of RCA; one set of PRE-IN
Working conditions: temperature: 0 ° C-40 ° C, humidity: 20% -80%
Storage conditions: temperature: -20 ° C-70 ° C, humidity: 20% -90%
Overall volume: 430mm X 445mm X 239mm
Net weight: 43kg
