The 5814 is a military-specification 12AU7 designed for low noise and long life. It is a direct sub for the 12AU7. Most of these were manufactured between the late 1950s and middle 1960s.
All tubes were negative for short and grid leakage, and passed the life test unless otherwise noted. The minimum GOOD reading on my Sencore tester is 70. Most new 12AU7 types test around 90.
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Tube 1 GE 5814A 3 micas, gray plates, support rods, full white logo, 59-2? Date code 91/91 $12
Tube 2 GE 5814A 3 micas, gray plates, support rods, copper rods, no logo 91/91 $8
Tube 3 GE 5814A 3 micas, gray plates, support rods, copper rods, partial logo 90/90 $10
Tube 4 GE 5814A 3 micas, gray plates, support rods, copper rods, partial logo 91/92 $10
Tube 5 Tung-Sol 5814A 2 micas, gray plates, full white logo, NIB, 90/90 $12
Tube 6 GE 5814 3 micas, black plates, copper rods, no logos, 88/83, Life ? $5
Tube 7 GE 5814 3 micas, black plates, copper rods, no logos, 89/87, Life Almost ? $8
Tube 8 Raytheon 5814A, gray platess, 3 micas, halo getter, good logo, Life ? $5
These tubes with ? life test results play fine. They just won’t last as long as those that test good, and are priced accordingly.
