Amperex
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Product Summary
Model: 1966 Amperex EL84 6BQ5 (Made in Austria)
Soundlumia Tube Sound Rating: 9.0/10 - Outstanding
Date codes:
KM4 A6E2 (KM4 = EL84 production gen #4, A = Vienna, Austria, 6 = 1966, E = May, 2 = Week 2 of the production month)
KM4 A6E4 (KM4 = EL84 production gen #4, A = Vienna, Austria, 6 = 1966, E = May, 4 = Week 4 of the production month)
GM (Mutual Conductance) test result: 79%/98% of NOS/NEW
Silkscreen: 90% - 100%
Packaging: New white box
Professional Tube Testing
Tube 1:
Measured transconductance (GM): 8.88 mA/V - 79% (100% = 11.30 mA/V)
Measured plate current (IA): 29.605 mA - 62% (100% = 48mA)
Tube 2:
Measured transconductance (GM): 11.13 mA/V - 98% (100% = 11.30 mA/V)
Measured plate current (IA): 44.77 mA - 93% (100% = 48mA)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
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