[Sound Description]
High sound density with warmth (characteristic of carbon-coated tubes), powerful bass, transparent sound quality (characteristic of direct-heated tubes), and strong resolution.
[Product Features]
◆ The 6C33 uses AC filament lighting, followed by a 20x amplification stage. When paired with 90dB sensitivity speakers, only a minimal amount of AC hum is present.
◆ Driven by 6P9P tubes, the 6C33 delivers an output power of over 15W x 2. Suitable for speakers with impedance between 4-8 ohms and sensitivity above 88dB.
◆ Utilizes metal film resistors with 1% precision and imported electrolytic capacitors. The power filter capacitors feature a main capacitor from Korea's SAMYOUNG and secondary capacitors from Japanese brands.
◆ Multi-stage C (capacitor) L (1H 1A choke) R (resistor) C filtering ensures a high signal-to-noise ratio.
◆ Equipped with a fully powered, low-temperature rise pure copper wire EI133X60 power transformer (code: ) and a 100W output transformer made with Japanese Z11 iron core and pure copper wire (code: OP1145009).
◆ Coupling capacitors use German WIMA film copper-pin capacitors, delivering rich sound and delicate, transparent highs.
◆ The unit employs Soviet-era 6C33 x 2 tubes, Shuguang 6P9P tubes x 2, and Beijing 6N3-J preamp tubes x 2.
◆ Fully hand-wired point-to-point soldering, strictly designed with tiered grounding principles for a clean layout and high signal-to-noise ratio.
◆ Dimensions: Width 430mm, Depth 330mm, Height 230mm (including tube height).
◆ Net weight: 25kg (Note: When comparing prices, please also compare the weight of the unit. Our transformers and materials are genuine and fully exposed without potting or covers, so everything is visible. Those 6C33 units weighing only around 10kg may be cheaper, but their performance is self-evident.)
◆ Chassis materials: Top plate is 2mm thick mirror-finished stainless steel, base plate is 1.5mm thick iron with heat dissipation grilles for effective cooling. The wood frame is made of solid sapele wood, not veneer, with a thickness of 20mm for sturdiness and resistance to deformation.
[Performance Parameters]
Output Power: 15W x 2
Frequency Response: 20Hz - 26kHz (±1dB)
Sensitivity: 1V
Distortion: <1.5% at 5W
Signal-to-Noise Ratio: 95dB
Input Impedance: 100k ohms
Output Impedance: 4Ω / 8Ω
Power Consumption: 250W
Total Weight: 25kg
[Circuit Reference Schematic]
