Philips
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Product Summary
Model: 1964 Philips EL84 6BQ5 - Valvo Label (Made in Holland)
Soundlumia Tube Sound Rating: 9.0/10 - Outstanding
Date codes:
rX4 ⊿4C1 (rX4 = EL84 production gen #4, ⊿ = Heerlen, Holland, 4 = 1964, C = March, 1 = Week 1 of the month)
rX4 ⊿4H4 (rX4 = EL84 production gen #4, ⊿ = Heerlen, Holland, 4 = 1964, H = August, 4 = Week 4 of the month)
GM (Mutual Conductance) test result: 91%/92% of NOS/NEW
Silkscreen: 50% - 65%
Packaging: New white boxes
Professional Tube Testing
This set was tested and certified by RoeTest V11 tester with the following result:
Tube 1:
Measured transconductance (GM): 10.25 mA/V - 91% (100% = 11.3 mA/V)
Measured plate current (IA): 42.59 mA - 89%/89% (100% = 48 mA)
Tube 2:
Measured transconductance (GM): 10.38 mA/V - 92% (100% = 11.3 mA/V)
Measured plate current (IA): 45.67 mA - 95% (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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