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Amperex 12AU7 ECC82 Matched Pair - Bugle Boy - Holland 1961 - Same Code

Amperex 12AU7 ECC82 Matched Pair - Bugle Boy - Holland 1961 - Same Code

Regular price $204.00 USD
Regular price Sale price $204.00 USD
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Product Summary

With strong NOS performance and pristine condition, this special pair of vintage tubes are priced to sell! Right here at Soundlumia's eBay store, and we believe it's the best choice they've ever made just like many others among us audiophiles.

Sound Qualities

You get the "textbook" Amperex Holland midrange presentation that is transparent, natural and expansive, with a slight touch of warmth that illuminates your musical world. The top end is super airy, smooth and nicely extended like one would expect from the best Siemens tubes. Vocals are intimate, sweet and forward (but not right in your face) and that always reminds me how the vocals sound on the best Mullard tubes. Bass is deep and well controlled and the accuracy feels very similar to the high end German ECC82's (Siemens, Telefunken.) 

Professional Sound Evaluation

The pair 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: Woo Audio WA7 Fireflies (3rd gen) Balanced Headphone Amplifier
 - Output: Focal Clear MG Pro open-back headphones

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

Professional testing & sound evaluation

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

Tube 1: 

Measured transconductance (GM): 1.96/2.24 mA/V  - 89%/102%  (100% = 2.2 mA/V)
Measured plate current (IA): 9.61/11.672 mA  - 92%/111%  (100% = 10.5mA)

Tube 2:

Measured transconductance (GM): 1.86/2.11 mA/V  - 85%/96%  (100% = 2.2 mA/V)
Measured plate current (IA): 9.272/10.465 mA  - 88%/100%  (100% = 10.5mA)

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

Curve trace is also included in the original RoeTest report.
Appearance & cosmetic condition

we treasure this pair because the pristine cosmetic condition the two tubes are in - over 90% of the paint is intact. The identical Heerlen date codes etched on glass are perfectly visible on both tubes:

Gf7 1L1 (Gf7 = ECC82 Production Gen #7, ⊿= Heerlen, Holland, 1 = 1961, L = December, 1 = 1st week of the month) 
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