Vacuum Tube Preamplifier Class A Single-Ended XLR Balanced Audio Preamp ARC LS22 Standard 220V

Vacuum Tube Preamplifier Class A Single-Ended XLR Balanced Audio Preamp ARC LS22 Standard 220V

Description:
The circuit refers to the research LS22 circuit, balanced mono design.The sound is soft and sound-resistant, high-frequency is extended, medium and low-frequency is mellow, the listening feeling is very quiet, suitable for long-time listening. Adding it between sound source and amplifier the improvement is very obvious, many people usually connect the power amplifier to decoder or CD player directly and the sound will be often rough, not delicate enough, lacking layers.

Features:
- A spacer is added between the circuit board and the transformer to prevent interference. The specially designed relay input selection circuit does not cause other groups of sound crosstalk to the current channel.
- Output delay design prevents DC output shock amplifier or speakers. Both groups of high voltage use op amp servo + FET regulator, low temperature wave, high speed, quieter background, better reproducing the sound.
- The potentiometer uses stepping ALPS 27 (built-in precision resistor) to make the volume control more precise when used for dual mono balance. Treble and bass control is based on Marantz PM17 circuit.
- High-end materials are used for better sound, such as 90W Japan Z11 iron core, WIMA, Nichicon and SONICAP capcaitors, rhodium-plated RCA seat and so on.
- A switch is designed to turn on/off the tone control, more convenient to enjoy original sound or obtain more delicate sound with treble and bass control knob. The needle of VU meter can be stopped swing, but the meter lamp cannot turned off.

Specifications:
- Audio input: 3 groups of stereo RCA + 1 group mono XLR
- Audio output: 2 groups of stereo RCA + 1 group mono XLR
- Tube: 6N11*4 ( can be replaced by E88CC, 6922)
- Input power: AC 100-120V 220-240V 50/60Hz
- SNR: DC filament 100dB (output 2V)
- Gain: 6.5 times
- Frequency range: 5HZ-100K (±0.5dB)
- Input impedance: 100K
- Output impedance: 200 ohms
- Maximum output voltage: 22V RMS
- Distortion: 0.1% (VU meter turned off, no negative feedback)
- Chassis: full aluminum
- Dimensions: 430*330*100 mm
- Net weight: 10KG

Package Included:
- 1 x Tube Preamp

Note:
1. If you want Full Balanced Input and Output, please buy 2PCS and the best matched power amplifier .
2. The position of each tube is specific, before shipping we will test to make it in the best condition ), and please don't insert it at random, otherwise its performance will be affected.
3. Only support DC power input, the function of AC power input and DC/AC switch are cancelled for better clear sound.