Ray Tubes KT88 (Select)
Even Better
The SELECT Collection is built as well as the CORE Collection but sounds even better. This tier far outperforms standard factory tubes.
Hand-selected and tested
Gold pins for corrosion resistance and excellent conduction
A substantial upgrade from standard NOS tubes
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
Even Better
The SELECT Collection is built as well as the CORE Collection but sounds even better. This tier far outperforms standard factory tubes.
Hand-selected and tested
Gold pins for corrosion resistance and excellent conduction
A substantial upgrade from standard NOS tubes
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
Make Your Good Amp Great
The SELECT Collection boosts your amp noticeably. These tubes bring out better sound, even in beginner models. Each tube is handpicked by our engineers for clarity, texture, and detail. Your music will sound more real, emotional, and precise.
The SELECT Vacuum Tube Difference
The SELECT tubes come from the same batches as our CORE Collection. They stand out for one reason: expert judgment. Our engineers evaluate each tube for sound profile, dynamics, microphonics, gain, conductance, noise, and overall performance. This careful selection ensures only the best tubes make it into the SELECT Collection.
12-Month Warranty
We trust our product. We offer a 12-month warranty on our vacuum tubes. This warranty covers any manufacturing defects.
Technical Specifications
Tube Type: KT88
Tube Socket: 8-pin
Max Anode Dissipation Power: 42 W
Max Screen Dissipation Power: 8 W
Max Anode + Screen Dissipation Power: 46 W
Max Anode Voltage: 800 V
Max Screen Voltage: 600 V
Max Grid Voltage: ~200 V
Max Cathode Current: 230 mA
Heater Voltage: 6.3 V
Heater Current: 1.6 A
Transconductance: 12 mA/V
Amplification Factor: 8
Total Height: 119 mm
Tetrode Connection
Screen Voltage: 250 V
Anode Voltage: 250 V
Anode Current: 140 mA
Grid Voltage: 15 V
Grid Current: 3 mA
Internal Resistance: 12 kΩ
Amplification Factor: 8
Triode Connection
Anode Voltage: 250 V
Anode Current: 143 mA
Grid Voltage: 15 V
Internal Resistance: 670 Ω
Amplification Factor: 8
Package Contents
Set of four, two, or single vacuum tube
User handbook featuring burn-in guidelines
Certificate of authenticity and warranty
