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Ray Tubes - SELECT 300B Direct Heated Triode Power Tube
SKU
RT-SL-300B
Ray Tubes - SELECT 300B Direct Heated Triode Power Tube is available to buy in increments of 1
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Ray Tubes - SELECT 300B Direct Heated Triode Power Tube
The Ray Tubes SELECT 300B is a directly heated power triode for the output stage of compatible 300B amplifiers. It uses a four-pin base and a 5 V filament. Ray Tubes lists 6.6 W of output under its typical test conditions.
Ray Tubes selects and tests each tube by hand. Gold-plated pins help resist corrosion at the socket contacts. The SELECT 300B has full, slightly warm midrange, controlled bass, and smooth treble. That balance can appeal to listeners who want voices to retain their body and string overtones to come through clearly.
The SELECT 300B comes individually or in sets of two or four, giving you options for keeping a spare or replacing a full set. Each package includes a handbook with burn-in guidance and a certificate of authenticity
Features:
- Directly heated power triode for compatible 300B amplifier output stages
- Hand selected and tested to Ray Tubes’ SELECT standards
- Gold-plated pins help resist corrosion at socket contacts
- 4-pin base with a 5V filament
- Available individually or in sets of two or four
- Includes a handbook with burn-in guidance
Specifications:
| Tube Type | 2A3 |
| Tube Socket | 4-pin |
| Filament Voltage | 2.5 V |
| Filament Current | 2.5 A |
| Maximum Plate Voltage | 300 V |
| Maximum Plate Dissipation | 25 W |
| Input Capacitance (Zero Bias) | 7.5 pF |
| Output Capacitance (Zero Bias) | 5.5 pF |
| Grid-to-Plate Capacitance (Zero Bias) | 16.5 pF |
| Typical Plate Voltage | 250 V |
| Typical Grid Voltage | −45 V |
| Typical Plate Current | 60 mA |
| Typical Transconductance | 5.25 mA/V |
| Typical Plate Resistance | 800 Ohms |
| Typical Amplification Factor | 4.2 |
| Typical Output Power | 3.5 W |
| Warranty | 1-year manufacturer warranty |
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