MUZISHARE R90｜Audiophile‑Grade Pure Vacuum Tube Preamplifier with Frequency Tone Adjustment

Features of R90:

1. The power transformer made of Z11 iron core with high-end special technology and special materials.

2. The front-stage main circuit uses two 12AX7 vacuum tubes and four 6KE8 vacuum tubes.

3. The phono circuit uses two 6KE8 vacuum tubes plus RIAA circuit to realize MC/MM function

4. The high-voltage power supply uses a 17BE3 vacuum tube as tube rectification and a 12DT5 vacuum tube as a tube voltage stabilization circuit

5. Fixed high and low frequency point boost selection function, with a direct selection switch

6. Six groups of signal input (MC-H, MC-L, MM, CD, AUX, BALANCE)

7. This machine has specially added two groups of RCA output and one group of balanced output function

8. Power-on high voltage delay and mute delay function (about 30 seconds)

9. Select Japanese ALPS high-end potentiometer

10. Peripheral output level meter function

11. The sound is soft, pure and smooth, suitable for enjoying various types of music

Amplifier circuit Specifications:

Gain: 16dB

Harmonic distortion: 1% (1KHZ)

Frequency response: 15Hz~30KHz (-1.5dB)

Input sensitivity: 180mV

Input impedance: 100KΩ

Output impedance: 5KΩ

Signal-to-noise ratio :95dB

Left and right output balance: <0.5db

Power consumption: 65W

Net weight: 13KG

Vacuum tubes used: 12AX7x2, 6KE8x6, 12DT5x1, 17BE3x1

Power supply voltage: ~115/230V+5%(50HZ)

PHONO specifications:

Gain: MM:50dB MC:720B

Harmonic distortion: 0.08%(1KHZ)

Frequency response: RIAA bandwidth: 0.25dB 20Hz to 20KHZ

Input sensitivity: MM:6mV MC:0.5mV

Input impedance: MC:100Ω MM: 50KΩ

Signal to noise ratio: MC:780B MM:85dB