Amperex

Amperex 7025 (Ultra low-noise ECC83)

$280.00 USD

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Tube Selection Matched Pair Single Tube

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Soundlumia's Opinion

And the award of "the quietest tube on the planet" goes to...Amperex Holland 7025! Virtually identical to ECC83/12AX7 but with nearly non-existent hum and noise thanks to the unique spiral wound filament design that effectively packs two tubes in one glass envelop, the Holland made 7025 tubes preferred by audio professionals and hardcore enthusiasts.

We have evaluated at least 10 different versions of Orange Globe tubes and the mid-1960s' Holland sound is clearly among the best. 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 ECC83's (Siemens, Telefunken.)

Matched Pair

Amperex 7025 12AX7 Matched Pair - Holland 1967 - Orange Globe - Same code - NOS

$280

Professional Tube Testing

Both tubes tested Super Strong NOS (120%+ nominal mutual conductance) on a reliable and recently calibrated Mercury 2000 tube tester with the following results for mutual conductance both in uhMos and percentage of nominal:

Tube 1: 1,430/1,400 (143%/140%)

Tube 2: 1,390/1,400 (139%/140%)

Good tubes start at 700 and new tubes (incl. NOS/NIB) 1,000, and the Mercury 2000 tester's rated mutual conductance (nominal) for new tubes is 1,000. Test results can be seen in the pictures. In case you wonder what all these numbers mean to your sound experience, it's actually quite straightforward: mutual conductance directly translates to a tube's ability to amplify sound, so the higher these numbers the stronger. No short, leakage or gas.

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. What a rare find!

⊿7H1 (⊿ = Heerlen, Holland, 7 = 1967, H = August, 1 = 1st week of the month)

Packaging

Original Amperex tube boxes.

Single Tube

1x Amperex 7025 (Ultra Low-noise ECC83) - Orange Globe - Holland '67 – Near NOS

$139.45

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): 1.35/1.74 mA/V - 84%/109% (100% = 1.6 mA/V)

Measured plate current(IA): 0.985/1.33 mA - 82%/111% (100% = 1.2 mA)

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