Philips
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Product Summary
Model: 1967 Philips EL84 6BQ5 (Made in Austria)
Soundlumia Tube Sound Rating: 9.0/10 - Excellent
Date codes:
KM4 A7I4 (KM4 = EL84 production gen #4, A = Vienna, Austria, 7 = 1967, I = September, 4 = Week 4 of the production month)
KM4 A7B1 (KM4 = EL84 production gen #4, A = Vienna, Austria, 7 = 1967, B = February, 1 = Week 1 of the production month)
GM (Mutual Conductance) test result: 94%/98% of NOS/NEW
Silkscreen: 85% - 90% (Excellent)
Packaging: NEW white tube boxes.
Professional Tube Testing
This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result:
Tube 1:
Measured transconductance(GM): 10.62 mA/V - 94% (100% = 11.30 mA/V)
Measured plate current(IA): 43.72 mA - 91% (100% = 48 mA)
Tube 2:
Measured transconductance(GM): 11.13 mA/V - 98% (100% = 11.30 mA/V)
Measured plate current(IA): 47.09 mA - 98% (100% = 48 mA)
NO shorts, leakage or gas. NO noise or microphonics.
Curve trace is also included in the original RoeTest report.
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