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Philips EL84 6BQ5 Matched Pair - Valvo Label - Heerlen, NL 1964 rX4 - Near NOS

Philips EL84 6BQ5 Matched Pair - Valvo Label - Heerlen, NL 1964 rX4 - Near NOS

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Sound Sample:

Product Summary

Model: 1964 Philips EL84 6BQ5 - Valvo Label (Made in Holland)

Soundlumia Tube Sound Rating9.0/10 - 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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