Product Introduction:
The Class A amplifier utilizing the 6p14 vacuum tube circuit is gaining increasing attention. The primary reason is that Class A amplifiers eliminate crossover distortion and do not produce harsh odd-order harmonics, which is crucial for achieving pure sound quality. Secondly, Class A amplifiers operate consistently under optimal conditions, avoiding the switching distortion common in Class B amplification. A notable feature is the ability to eliminate large-loop negative feedback, thereby preventing transient intermodulation distortion and significantly improving dynamic performance.
Material Specifications:
1. Pre-stage driver tube: Beijing 6N1-J dedicated dual triode for audio.
2. Power supply filter capacitor: Siemens 150UF; secondary filter capacitor: Nippon Chemi-Con 33UF.
3. Interstage coupling capacitor: Hong Kong high-end TE MKP film capacitor.
4. 5W high-power resistors: metal oxide film resistors; other resistors: high-quality full copper pin metal film precision resistors.
5. Rated output power: 3.5W × 2.
6. Rectification tube: 5Z4P vacuum tube for smoother, warmer sound with strong resolution compared to transistor rectification.
7. Fully hand-wired point-to-point soldering with a rigorous and rational layout; overall wiring adopts a single-point grounding method.
8. Stable and reliable operation with smooth, rounded sound, wide soundstage, strong stereo imaging, solid and powerful bass, excellent signal-to-noise ratio, and broad dynamic range. Clear details and versatile performance across all music genres. Ideal for driving high-sensitivity speakers under 5 inches (recommended sensitivity above 90dB).
9. Power transformer (model ZL864504): 100W power, oxygen-free copper winding, core made of Wuhan Steel high magnetic flux annealed sheets, operates without overheating or vibration.
10. Output transformer (model OP663501): 7W power, impedance 5K:0-4R-8R, oxygen-free copper wire layered winding with 3+2 construction, core made of Japanese Z11 sheets for powerful bass and wide frequency response. Inductance up to 25H; budget transformers with domestic cores typically have only around 10H inductance and narrow frequency range.
11. AC filament supply for vacuum tubes for livelier music; 3.15V-0-3.15V center-tapped grounding design eliminates annoying background noise.
12. Silver-plated ceramic tube sockets; optional upgrade to gold-plated for an additional 20 RMB.
13. Japanese ALPS A100K potentiometer, durable and long-lasting.
14. Pure gold-plated copper RCA jacks and speaker terminals.
15. Standard tubes: Soviet OTK (85% new) 6N14N × 2, Shuguang 5Z4P × 1, Beijing 6N1 × 1.
Appearance Dimensions:
1. Chassis material: 20MM thick solid mango wood front panel, 1.2MM thick painted steel case.
2. Product weight: approximately 6.5kg.
3. Product dimensions: width 300mm, height 145mm, depth 230mm (including tube height).
Performance Parameters:
Power: 3.8W × 2.
Input impedance: 100K.
Input: one RCA input.
Output: 0-4R-8R.
Speaker terminals: 2 sets.
Frequency response: 20-30KHz ±2dB.
Output signal-to-noise ratio: >95dB "A"-weighted.
Total harmonic distortion: <1%.
