This preamplifier is an original design of a fever full-balanced tube preamplifier. Its appearance is a bit similar to the Gao Wen preamplifier. The internal circuits are all designed by ourselves. It is a flagship preamplifier (the sound quality and materials are all flagship models); the power supply part is still a very good Class A parallel voltage regulator, the human voice is very thick, especially the female voice is very comfortable to listen to. The transformer is 2 Nippon Steel A-grade iron core 60W*2 with epoxy resin and shielding cover; the input and output coupling capacitors are precisely matched Mondofo oil-immersed capacitors.
Product parameters
Frequency response: 5Hz-160KHz (+0/-2dB)
Input impedance/input sensitivity: 47K/2V
Output impedance: 800Ω
Rated output (20Hz-20kHz): 2V
Maximum output (20Hz-20kHz): 15V (RCA); 24V (XLR)
Signal-to-noise ratio: 112dB (RCA), 112dB (XLR)
Total harmonic distortion (20Hz-20kHz): 0.01% (RCA), 0.015% (XLR)
Dimensions: 430W*110H*390D (mm)
Net weight: about 8.5 kg
Power consumption: static 30W, maximum 80W
Amplification working mode: Class A
Four inputs (2 single-ended + 2 balanced), four outputs (2 single-ended + 2 balanced).
The power plug contains a fuse, and there is a small groove on the plug. You can pry it with your hand or a flat-blade screwdriver to remove the fuse sleeve and see the fuse, which is convenient for replacing the fuse.
After turning on the power, the tube preheats for about 30 seconds, and then the high-voltage rectifier starts to start, which can greatly increase the life of the tube.
In the front-stage power supply part, the yellow relay is the high-voltage soft-start function of the front-stage tube. The characteristics of the electronic tube determine that the filament is heated first and then the voltage is applied. This can extend the service life of the electronic tube. This soft-start principle: when the front-stage power is turned on, the filament of the electronic tube is first heated for about 30 seconds. After the high-voltage part is turned on, rectification and filtering begins, and the high-voltage filtering is to steadily and slowly increase the voltage until it stabilizes. This time is about 10 seconds, which can further protect the electronic tube and extend its life; the output relay is not turned on until the last 10 seconds. Fix the machine and set it to take about 50 seconds to warm up before turning on the output. The shutdown output is instantly disconnected, which can protect the subsequent stages. There are no strict requirements on the switching sequence of the front and rear stages to protect the subsequent stages.
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