Philips

Philips 12AU7 ECC82 Long Plates Foil D 45° Getter Siemens Label - Holland 1955

$382.00 USD

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Product Summary

The "textbook Heerlen sound" has been referenced in several Soundlumia listings of Amperex Holland 12AU7/ECC82 tubes, and many tube enthusiasts asked what that all means. So this is the answer: the late 1950s and very early 1960s tone, the beginning of over a decade's excellence in sound, the classic tonal template for all the great (and greater) Amperex/Philips/Valvo/Miniwatt tubes to be made in the years to come, the timeless Philips radio tone that many of us grew up listening to.

Sound Qualities

The most distinctive sound feature of the Heerlen 12AU7's is the transparent, natural and expansive midrange presentation, with a slight touch of warmth that illuminates your music. Every piece of music you play through these tubes sounds like from a vinyl record, whether your sound source is phono or not. The sound stage is spacious, deep, structured and holographical. Bass is incredibly deep but well controlled and feels as accurate as on the high end German ECC82's (Siemens, Telefunken, Valvo Hamburg etc.) The stellar performance of foil d-getter takes all these wonderful sound qualities to a whole new level: instrument separation is super clean, detail retrieval is surreal, and it goes without saying that the extremely low noise on these tubes is to the vanishing point.

Professional Sound Evaluation

The tube worked wonderfully and sounded terrific in our professional studio setup for monitoring.

- Input: Cambridge Audio CXC V2 dedicated CD transport + Schiit Audio Bifrost 2 Multibit DAC

- Amplification: Handcrafted Bottlehead Crack Headphone amplifier

- Output: Neumann NDH 20 Closed Back Studio Headphones

Our full tube sound review was written 100% based on the actual listening experience while this tube was running in the system described above.

Professional Tube Testing

This tube was tested and certified by RoeTest V11 tester with the following result:

Measured transconductance (GM): 2.19/1.9 mA/V - 100%/86% (100% = 2.20 mA/V)

Measured plate current (IA): 10.562/8.462 mA - 101%/81% (100% = 10.50 mA)

NO shorts, leakage or gas. NO noise or microphonics.

Curve trace is also included in the original RoeTest report.

Appearance & cosmetic condition

This tube is in pristine NIB condition. 100% of the paint is intact and well preserved. The Heerlen factory date code etched on glass is perfectly visible:

K61 ⊿5H (K61 = Long plates ECC82 production gen #1, ⊿ = Heerlen, 5 = 1955, H = August)