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Ray Tubes - SELECT KT88 Beam Tetrode Power Vacuum Tube
SKU
RT-SL-KT88
Ray Tubes - SELECT KT88 Beam Tetrode Power Vacuum Tube is available to buy in increments of 1
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Ray Tubes - SELECT KT88 Beam Tetrode Power Vacuum Tube
The Ray Tubes SELECT KT88 is a new-production beam tetrode for the output stage of a compatible tube amplifier. Its eight-pin octal base and 119 mm overall height give owners two reference points when checking socket fit and clearance under a tube cage. Ray Tubes publishes separate operating characteristics for tetrode and triode connections, reflecting how the tube can be used in different amplifier circuits.
Ray Tubes selects and tests each tube by hand. Gold-plated pins help resist corrosion at the socket contacts. The manufacturer describes the KT88’s sound as having deep, controlled bass and a full midrange, with the dynamic range to convey the contrast between quiet passages and orchestral peaks.
The SELECT KT88 comes in sets of two or four. Choose the quantity that matches your amplifier’s output stage, whether you’re keeping a spare or replacing a full set. Each package includes a handbook with burn-in guidance and a certificate of authenticity.
Features:
- New-production KT88 beam tetrode for compatible amplifier output stages
- Hand selected and tested to Ray Tubes’ SELECT standards
- Gold-plated pins help resist corrosion at socket contacts
- 8-pin octal base with a 4.69" (119 mm) overall height
- Available individually or in sets of two or four
- Includes a handbook with burn-in guidance
Specifications:
| Tube Type | KT88 |
| Tube Socket | 8-pin octal |
| Maximum Anode Dissipation | 42 W |
| Maximum Screen Dissipation | 8 W |
| Maximum Combined Anode and Screen Dissipation | 46 W |
| Maximum Anode Voltage | 800 V |
| Maximum Screen Voltage | 600 V |
| Maximum Grid Voltage | Approximately 200 V (as listed) |
| Maximum Cathode Current | 230 mA |
| Heater Voltage | 6.3 V |
| Heater Current | 1.6 A |
| Transconductance | 12 mA/V |
| Amplification Factor | 8 |
| Tetrode Connection | Screen voltage: 250 V Anode voltage: 250 V Anode current: 140 mA Grid voltage: 15 V (as listed) Grid current: 3 mA Internal resistance: 12 kOhms Amplification factor: 8 |
| Triode Connection | Anode voltage: 250 V Anode current: 143 mA Grid voltage: 15 V (as listed) Internal resistance: 670 Ohms Amplification factor: 8 |
| Overall Height | 4.69" (119 mm) |
| Warranty | 1-year manufacturer warranty |
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