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Philips EL84 6BQ5 Matched Pair - Lorenz/Valvo Labels - Vienna '67 KM4 - Near NOS

Philips EL84 6BQ5 Matched Pair - Lorenz/Valvo Labels - Vienna '67 KM4 - Near NOS

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Product Summary

Model: 1967 Philips EL84 6BQ5 (Made in Austria)

Soundlumia Tube Sound Rating9.0/10 - 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 result94%/98% of NOS/NEW

Silkscreen: 85% - 90% (Excellent)

PackagingNEW 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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