OldChen C1 HI-end 6H8C/CV181-SE Vacuum tube Pre-amplifier Bass adjustment preamp

Features and parameters of this machine:
1. With the direct amplification function of ordinary bile preamp, and adding a moderate high and low tone adjustment, you can adjust the tone according to your preferences, and you can make the details of the music more clear and listening at a low volume. Regardless of whether it is equipped with a tube amplifier or a stone machine, it can both polish and enhance the strength of high frequency resolution and low frequency and the overall dynamic range.
The extremely low noise is basically negligible, the minimum volume is 0.08 mV, the maximum volume is 0.7 mV, and the signal-to-noise ratio is as high as 96db.
The distortion is about 0.15%, the frequency response curve is flat, and all indicators are actually measured.

2. External large margin el pure copper transformer, 10h inductance, clc filter, bile rectifier linear voltage regulator, two-stage direct-coupled cathode output circuit, all ruby electrolysis, rel fever coupling, Weimar tone, high precision metal film resistor , 5 pure copper gold-plated stainless steel ceramic sockets, Omron relay is responsible for 4-way input and high and low bass intervention switching, reasonable matching components and layout make the appearance and performance of the whole machine reach the ideal state.
The rectifier tube adopts the old Nanjing new stock direct heat rectifier tube, the standard configuration is matched with 4 Russian imported 6H8C, and the high configuration is matched with the voice of the noble 4 large wave gallbladder CV181-SE. The tube is replaced for free within one year.

3. The whole machine adopts a large chassis with a standard size of 43 cm and a double-head design with a stable atmosphere. The external bile duct is convenient for tube replacement to increase playability. The net weight is 12 kg and 15 kg after packaging.

Standard Soviet 6h8c version:

Upgraded version of CV181-SE: