12AX7 ( ECC83 ) SYLVANIA Long Black Plates Foil Getter AMPLITREX Tested Tube MADE IN USA '50s
Description:
This 12AX7 / ECC83 SYLVANIA, Made in USA 1950s production, represents one of the most appreciated configurations of the historic American production of small signal tubes.
The construction with Long Black Plates and characteristic Foil Getter identifies a type highly sought after today by vintage electronics enthusiasts for its construction quality, historical charm, and sonic personality.
It is a used tube, carefully tested and selected in our laboratory using an AMPLITREX AT-1000 Tube Tester.
Sylvania productions with long black plates have always been appreciated for their ability to combine musicality, balance, and naturalness, while maintaining that typical American sound signature that made the best tubes of the era famous.
From an aesthetic point of view, the tube retains the authentic charm of 1950s vintage productions, with the characteristic internal structure of long black plates that continues to attract the interest of audiophiles, technicians, and collectors today.
Sonic Characteristics
12AX7 Sylvania Long Black Plates are generally appreciated for an balanced, natural, and harmonically rich sound presentation.
Their sound signature tends to favor fluidity, tonal accuracy, and a remarkable ability to reproduce the musical message in a credible and engaging way.
Bass
The bass range is well controlled and natural, with a good sense of solidity and a consistently orderly and musical presentation.
Mids
The mids represent one of the strengths of this production. Vocals are credible and well-focused, while acoustic instruments and harmonics maintain a rich and pleasant texture.
Highs
The high range is fluid and well integrated into the overall sound context. Detail is present without being artificial, favoring prolonged and relaxed listening.
Dynamics
The dynamic response is natural and progressive, with a good ability to follow musical variations while maintaining coherence and control.
Soundstage
The soundstage appears stable and well organized, with correct instrument separation and a credible spatial presentation.
🎧 Use in Hi-Fi Amplifiers
This SYLVANIA ECC83 / 12AX7 is particularly suitable for:
- hi-fi preamplifiers
- line stages
- vintage and modern integrated amplifiers
- compatible driver stages
The Low Noise selection makes it particularly interesting for applications where quietness and tonal naturalness are important characteristics.
🎸 Use in Musical Applications
In the field of musical instrument amplifiers, Sylvania Long Black Plates are highly appreciated for their balanced and musical character.
This tube offers:
- good harmonic response
- natural and well-present mids
- progressive dynamic behavior
- contained noise
- authentic vintage character
These characteristics make it interesting for both vintage amplifiers and compatible boutique creations.
🎯 Note for audiophiles and technicians
This 12AX7 / ECC83 SYLVANIA Long Black Plates Foil Getter Made in USA 1950s represents a remarkable American vintage selection for those who desire a true vintage ECC83 with:
- Long Black Plates construction
- Foil Getter
- Low Noise
- well-balanced sections
- typical musicality of vintage American production
The internal VTT classification is STRONG, with a regular electrical profile, stable emission, and well-aligned sections.
A tube that retains the authentic charm of the best Sylvania productions from the golden age, selected according to Vacuum Tubes Treasures standards.
Test Results:
Tube tested on AMPLITREX AT-1000 Tube Tester:
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Test Conditions: Va = 250V ; Vg = -2V
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Average 100%: Gm = 1600 ; Ia = 1.2 mA
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Test Result: STRONG
Tube :
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Section 1: Gm = 1400 ; Ia = 0.8 mA
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Section 2: Gm = 1400 ; Ia = 0.9 mA
Additional Tests Performed:
- Microphonics: Standard. Tested and suitable for use in hi-fi and guitar amplifiers. Recommended for use in V2, V3, V4, as a driver or in less critical stages. Not recommended in V1 or in very high gain positions particularly sensitive to microphonics.
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Balance: The sections are consistent and well-aligned, making the tube also suitable for use as a phase inverter in hi-fi and instrumental applications.
- Emission Quality: Strong – Strong and regular emission, suitable for any application.
- Shorts and GAS: Absent.
Condition:
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Condition: Vintage - Tested and working - Supplied as shown in photos.
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Functionality: Perfectly operational.
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Aesthetic Condition: Fair – Markings completely disappeared. See photos for details.
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Manufacturing Code: absent – SYLVANIA USA production, identifiable by construction characteristics. 1950s
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