Sound Description
6N8P (6SN7) + KT88 (KT100) high-end tube amplifier, delivering powerful output, rich and natural sound quality, wide dynamic range, and abundant harmonics!
Technical Parameters
Tube types used: KT882; 6SN72; 5Z3PA1 (models like GZ34/274B/5U4G/5AR4 can be directly replaced)
Static power consumption: <100W
Power transformer rated power: 250W (EI114X50 core, oxygen-free copper wire)
Output transformer rated power: 40W (EI96X40 Japanese Z11 core, oxygen-free copper wire)
Rectification method: Tube rectification, inductive filtering
Signal-to-noise ratio: 95dB
Frequency response (±2 dB): 20 Hz - 38 kHz
Input sensitivity: 700mV
Distortion: <1% at 1W
Input impedance: 100kΩ
Output impedance: 4-8 ohms
Rated output power: 12W x 2
Dimensions (H x W x D): 200 mm x 350 mm x 290 mm
Net weight: 13kg
Component soldering method: PCB circuit board
Suitable for: Medium to high-sensitivity speakers, recommended 85dB and above, rated power within 150W.
Product Features
- Fully AC filament lighting for lively and dynamic sound. Even with 90dB sensitive speakers, no AC hum noise is audible, creating a silent experience as if the machine is off (with 5H choke).
- Utilizes audio-specific preamp tube 6SN7 to drive KT88, with a higher plate voltage of 450V compared to common circuits, achieving over 12W x 2 output power. Ideal for speakers with impedance of 4-8 ohms and sensitivity above 88dB.
- Rated output power: 12W x 2 (Tubes have strong overload capability, so the actual undistorted output power is comparable to a 60W+60W transistor amplifier! All stages operate in Class A amplification, resulting in low distortion, sweet and smooth sound, and exceptional listening endurance).
- Precision 1% metal film + carbon film copper leg resistors and imported electrolytic capacitors. Power filtering uses Japanese high-end capacitors.
- Multi-stage C (capacitor) L (choke) R (resistor) C filtering for high signal-to-noise ratio.
- Matching power transformer (model 1145012), rated 250W, wound with oxygen-free copper wire, low temperature rise, ample power.
Matching output transformer (model OP965006), output power 40W, made with new Japanese Z11 silicon steel sheets, oxygen-free copper wire layered and segmented in 4+3 winding, wide frequency response, low internal resistance, and high dynamics.
Matching choke EI66X35, 5H 0.25A, oxygen-free copper enameled wire, fully shielded casing, a noise reduction marvel.
- Coupling capacitors use Tokyo Electron vintage TE MKP film copper leg capacitors, delivering rich and mellow sound with fine, transparent highs.
- This unit uses 5U4G (5Z3PA) rectifier tube x1, 6N8P preamp driver tubes x2, and KT88 power amplifier tubes x2 (all three tube types have imported replacement options available for personal preference).
- PCB design strictly follows the single-point grounding principle, with 1-ounce copper thickness and trace widths calculated based on current flow, ensuring no background noise. Our machine pursues high cost-performance, using PCB to save on expensive point-to-point wiring and minimize errors, ensuring low failure rates.
- PCB specifications: 300mm x 110mm, 1.6mm thick fiberglass board.
Machine weight: 13 kg
Machine dimensions: 350mm width x 290mm depth (including knobs and terminals) x 210mm height (including tubes and chassis feet)
Circuit structure reference diagram (component parameters are based on actual parts, diagram for reference only):
