12AU7 ECC82 NOS Baldwin by Raytheon Long Black Plates Halo Getter Tested Balanced Tube USA'59

12AU7 (ECC82) NOS Baldwin by Raytheon Long Black Plates Halo Getter Tested Balanced Tube Made in USA '59

Description:

The 12AU7 / ECC82 NOS Baldwin by Raytheon , with long black plates and halo getter , produced in the United States in 1959 , represents one of the most successful expressions of the Raytheon school of the late 1950s. Originally intended for select Baldwin supplies, this version combines superior construction with a sound output of great authority and refinement.

The specimen is NOS , carefully checked in our laboratory and passed the tests with a VERY STRONG result. The valve is balanced , with very low noise and microphonics , characteristics that make it particularly suitable even for sensitive stages and high-resolution systems.

Sound Characteristics

Bass: Deep, compact, and well-controlled. The low register is solid and natural, with an excellent ability to give body and foundation to the soundstage.

Mids: Rich, dense, and harmonically complete. Vocals are textured and believable, with an elegant, never-invasive presence.

Highs: Smooth and well-extended, free from harshness. The highs are airy yet balanced, ideal for long, relaxed listening sessions.

Dynamics: Fluid and progressive. The response is prompt but never aggressive, with dynamics that favor naturalness and timbral coherence.

Soundstage: Wide and stable soundstage, with excellent separation of planes and precise focus of instruments.

🎧 Use in Hi-Fi Amplifiers

Perfect as a line tube or driver in high-quality hi-fi preamplifiers and amplifiers. Its combination of low noise, balance, and mature tone makes it ideal for high-end systems.

🎸 Use in Music Applications

Also appreciated in the musical field for its balanced response and warm, controlled character, suitable for contexts where musicality rather than aggression is sought.

🎯 Note for audiophiles and technicians

• NOS USA production (1959),
• VERY STRONG in testing,
• balanced ,
• with low noise & low microphonics ,
• selected for high-end applications.

A tube that combines historical prestige, excellent construction and an authoritative sound output , designed for those who want an authentic American sound experience in the Vacuum Tubes Treasures style.

Test Results:

Valve tested on AMPLITREX AT-1000 Tube Tester:

• Test Conditions: Va = 250V, Vg = -8.5V
• Average 100%: Gm = 2200 ; Ia = 10.5 mA
• Test Result: VERY STRONG

Valve:

• Section 1: Gm = 2000 ; Ia = 9.4 mA
• Section 2: Gm = 2000 ; Ia = 9.2 mA

Additional Tests Performed:

• Microphonics: Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.
• Balance: The sections are coherent and well aligned, making the valve also suitable for use as a phase inverter in hi-fi and instrumental applications.
• Functionality: Fully operational.
• Output Quality: Excellent – ​​Very strong and stable output, no fluctuations.
• Short circuits and GAS: Absent.

Conditions:

• Condition: Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.
• Cosmetic condition: Excellent – ​​Excellently preserved lettering, minimal signs of wear. See photos for details.
• Manufacturing Code: 280 59-33 → 280 indicates the manufacturer, i.e., Raytheon Mfg. Company, Newton 58, Mass. - 59-33 → RMA/EIA Open Date Code → manufactured week 33, 1959

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