KT88 RESERVE

Tube Pack: Single (1 tube)

Single (1 tube) Matched Pair (2 tubes) Matched Quad (4 tubes)

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Product Highlights

Hand-selected and tested
Gold pins for corrosion resistance and excellent conduction
A substantial upgrade from standard NOS tubes
Magic Coating: Monocrystalline carbon coating enhances sound by cooling, blocking noise, and allowing for quicker electron transmission
Low noise and microphonics
Fewer than 5% of the tubes commissioned for production meet our voltage, current, and sound signature standards
12-month warranty against manufacturing defects

Technical Specification

Tube Type: 300B
Tube Socket: 4-pin

Output Power

Power Output (Pout): 6.6 W

Filament Specification

Filament Voltage (Uf): 5 V
Filament Current (If): 1.2 A

Maximum Rating

Anode Voltage (Ua): 480 V
Anode Dissipation Power (Pa): 40 W
Cathode Current (Ik): 100 mA (self bias) | 70 mA (fixed bias)

Interelectrode Capacitance

Input Capacitance (Cin): 9 pF
Output Capacitance: 4.3 pF
Trans:er Capacitance: 15 pF

Interelectrode Capacitance

Anode Voltage (Ua): 300 V
Grid Voltage (Ug): -60 V
Anode Current (Ia): 60 mA
Transconductance (Gm): 5.5 mA/V
Internal Resistance (Ri): 0.7 kΩ
Amplification Factor (𝝻): 3.85

Package Content

Set of four, two, or single vacuum tube
User handbook featuring burn-in guidelines
Certificate of authenticity and warranty

Compatible Amps

Explore Ray Tubes' Tube Amp Compatibility List

Cheers from Oakland, California

Oakland is where we hang our hats. It’s a city with a history of hard work and artistry, and that’s something we take seriously. Also the tacos. We take those very seriously. 🌮🌮🌮