Unlock New Layers of Sound

The SELECT 6SL7 is the best 6SL7 vacuum tube you’ll ever need. It goes above and beyond the baseline with more involved production and stricter selection, all in pursuit of superior sound. The SELECT Collection brings out the best in all your favorites.

Hand selected and tested, the Ray Tubes SELECT 6SL7 is a substantial upgrade from both New Old Stock and other new production tubes. Fewer than 5% of production meets our standards.

The 6SL7 is a high-mu variant of the more common 6SN7. Like many tubes, it was used extensively for military purposes during World War II, but slowly fell out of use in the following decades. Starting in the 1970s, renewed interest in Japanese tube audio eventually led to a resurgence in 6SL7 popularity.

Sound Characteristics

The SELECT 6SL7 delivers a refined and engaging sonic character that faithfully captures the essence of the classic 6SL7 sound while offering modern improvements in clarity and balance. Ideal for preamp stages, vocal-focused systems, or high-fidelity tube setups, it continues the SELECT series’ pursuit of tonal refinement and musical realism.

1. Bass Performance
   More relaxed and grounded than comparable tubes, with good definition, control, and articulation. Drum hits and bass lines are clear, contributing to a cohesive soundstage and smooth integration with mids and highs.
2. Midrange Performance
   The standout strength of the SELECT 6SL7, characterized by a balanced tonal density and authentic presentation. Excels at conveying the nuances of vocals, violins, and cellos, while striking a pleasing balance between warmth and detail.

Treble PerformanceSpacious and non-fatiguing, with a natural extension and gently rounded top-end. String, piano, and vocal overtones are graceful and refined. Ideal for systems prioritizing musicality and long-term listening comfort.

Technical Specifications

• Tube Type: 6SL7
• Tube Socket: 8-pin

Filament (Heater) Ratings

• Filament Voltage: 6.3V
• Filament Current: 0.3A

Maximum Ratings (per triode)

• Plate Voltage: 300 V
• Grid Voltage: 0 V
• Plate Dissipation: 1 W
• Heater-to-Cathode Voltage: ±90 V

Static Characteristics (under typical conditions)

• Plate Voltage: 250 V
• Grid Voltage: –2 V
• Plate Current: 2.3 mA
• Transconductance: 1.6 mA/V
• Plate Resistance: 44 kΩ
• Amplification Factor: 70

Package Contents

• Matched pair or single vacuum tube
• User handbook featuring burn-in guidelines
• Certificate of authenticity and warranty

Compatible Amps

Explore Ray Tubes' Tube Amp Compatibility List.

The Ray Tubes One Year Warranty

Most vacuum tubes are notoriously fickle. That’s why warranties are rare. But we trust our products and we’re proud to offer our One Year Warranty against manufacturing defects. For more details, check out our warranty page.