Ray Tubes 12AU7 (Core)
Beyond the Ordinary
The CORE Collection is for audiophiles wanting more than standard tubes. Each tube is handpicked. Only the top performers make the cut. They meet our high standards for gain, conductance, noise, and microphonics.
Hand-selected and tested
Gold pins for corrosion resistance and excellent conduction
A substantial upgrade from standard NOS tubes
Low noise and microphonics
Matched pair (2 tubes) or single tube (1 tube)
Only 4% of the tubes commissioned for production meet our standards for gain and conductance matching
12-month warranty against manufacturing defects
Beyond the Ordinary
The CORE Collection is for audiophiles wanting more than standard tubes. Each tube is handpicked. Only the top performers make the cut. They meet our high standards for gain, conductance, noise, and microphonics.
Hand-selected and tested
Gold pins for corrosion resistance and excellent conduction
A substantial upgrade from standard NOS tubes
Low noise and microphonics
Matched pair (2 tubes) or single tube (1 tube)
Only 4% of the tubes commissioned for production meet our standards for gain and conductance matching
12-month warranty against manufacturing defects
Why New Stock is Better
The CORE Collection gives you the best of today’s technology.
NOS (New Old Stock) tubes have vintage charm but come with risks. Even unused, they can degrade. This leads to reliability issues and unpredictable performance. You might get bad sound quality or failure.
Ray Tubes new tubes have the latest tech and quality controls for better performance and reliability.
Technical Specifications
Tube Type: 12AU7 / ECC82 / 6189 / CV4003
Tube Socket: 9-pin
Max Anode Dissipation Power: 2.75 W
Max Screen Dissipation Power: N/A
Output Power in Class A1 Amp (Single Tube): N/A
Output Power in Class AB1 Amp: N/A
Max Anode Voltage: 300 V
Max Screen Voltage: N/A
Max Grid Voltage: ~50 V
Heater Voltage: 6.3 V
Heater Current: 0.3 A
Transconductance: 2.2 mA/V
Amplification Factor: 17
Internal Resistance: 7.7 kΩ
Package Contents
Pair of matched vacuum tubes or single vacuum tube
User handbook featuring burn-in guidelines|
Certificate of authenticity and warranty
