811A FU-811 Vacuum Tube Valve 4pcs Matched Quad(2pcs)

Technical Specifications: Model: 811A / FU-811 Type: High-Mu Power Triode Filament Voltage: 6.3V Filament Current: 4A Max Plate Dissipation: 65W Matching Accuracy: Ip error <5% Professional Q&A Logic: Q: Why is a "Matched Quad" necessary? A: For push-pull or parallel circuits, mismatched tubes cause current imbalance, leading to distortion or hardware overheating. Our precision matching prevents these issues. Q: Is this compatible with vintage 811A sockets? A: Yes, it follows standard 811A industrial dimensions and 4-pin configuration for seamless replacement. Q: How is the durability in high-frequency RF use? A: These tubes use reinforced internal structures specifically designed to handle the thermal stress of RF broadcasting.

• Core Application: Essential high power triode designed for RF amplifiers and high fidelity audio output stages requiring stable performance.
• Precision Matching: Expertly matched quad set ensures balanced plate current and consistent transconductance for optimal circuit signal stability.
• Premium Build: Features heavy duty glass envelope and high quality electrode materials for efficient thermal dissipation during operation.
• Standard Fit: Universal 4-pin base design allows for direct plug and play installation in vintage and modern equipment.
• Reliability Tested: Rigorously inspected for longevity to provide steady power output in demanding broadcasting and industrial environments.