GE & National 12AX7A / ECC83 New Old Stock Vacuum Tubes Sleeve of 4

GE & National 12AX7A / ECC83 New Old Stock Vacuum Tubes Sleeve of 4 (3 GE and 1 National)

TubeThe 12AX7A (also known as ECC83 or ECC803 in Europe) is a miniature dual triode vacuum tube widely regarded as one of the most influential and ubiquitous components in audio electronics. It's prized for its high voltage gain, low noise, and versatility, making it a staple in preamplifiers, guitar amplifiers, and hi-fi systems. The "

TubeThe 12AX7A (also known as ECC83 or ECC803 in Europe) is a miniature dual triode vacuum tube widely regarded as one of the most influential and ubiquitous components in audio electronics. It's prized for its high voltage gain, low noise, and versatility, making it a staple in preamplifiers, guitar amplifiers, and hi-fi systems. The "A" suffix denotes a minor electrical specification tweak from the original 12AX7, primarily for improved stability in certain applications, but the two are electrically interchangeable in most cases.HistoryThe 12AX7 was developed by RCA and released for public sale on September 15, 1947, as a compact replacement for larger dual-triode tubes like the 6SL7 used in audio amplification. It emerged in the post-World War II era amid a push for miniaturization in electronics. By the late 1940s, it became the go-to preamp tube for American and British amp manufacturers, powering everything from early hi-fi setups to iconic guitar rigs. Production peaked in the 1950s–1970s, with brands like RCA, GE, Sylvania, Mullard, and Telefunken churning out millions. Variants evolved over time, such as long-plate (1950s, warmer tone) and short-plate (1960s onward, brighter response) designs. While new production continues today (e.g., by JJ, Tung-Sol, and Electro-Harmonix), original New Old Stock (NOS) tubes from the golden era remain highly sought after for their perceived superior sound quality.Key Specifications

• Type: Miniature dual triode (two independent triode sections in one envelope).
• Base: 9-pin noval (B9A).
• Heater: 6.3V at 300mA or 12.6V at 150mA (parallel or series wiring).
• Amplification Factor (Mu): ~100 (high gain, ideal for preamp stages).
• Plate Resistance: 60–80 kΩ (high, contributing to low noise).
• Maximum Plate Voltage: 300V.
• Typical Applications: Voltage amplification, phase inversion, and cathode followers. The tube's design emphasizes low microphonics and hum, making it exceptionally quiet for audio use.

Common Uses

• Guitar Amplifiers: Heart of the preamp section in classics like Fender, Marshall, and Vox models—handles gain staging for overdrive and tone shaping.
• Hi-Fi and Studio Audio: Preamps, equalizers, and recording consoles for clean signal boosting.
• Other: Phono stages, effects pedals, and even some vintage synthesizers. Its high gain allows for rich harmonics and dynamic response, but it can be prone to microphonics (ringing) in high-vibration environments if not selected carefully.

A" suffix denotes a minor electrical specification tweak from the original 12AX7, primarily for improved stability in certain applications, but the two are electrically interchangeable in most cases.HistoryThe 12AX7 was developed by RCA and released for public sale on September 15, 1947, as a compact replacement for larger dual-triode tubes like the 6SL7 used in audio amplification. It emerged in the post-World War II era amid a push for miniaturization in electronics. By the late 1940s, it became the go-to preamp tube for American and British amp manufacturers, powering everything from early hi-fi setups to iconic guitar rigs. Production peaked in the 1950s–1970s, with brands like RCA, GE, Sylvania, Mullard, and Telefunken churning out millions. Variants evolved over time, such as long-plate (1950s, warmer tone) and short-plate (1960s onward, brighter response) designs. While new production continues today (e.g., by JJ, Tung-Sol, and Electro-Harmonix), original New Old Stock (NOS) tubes from the golden era remain highly sought after for their perceived superior sound quality.Key Specifications

• Type: Miniature dual triode (two independent triode sections in one envelope).
• Base: 9-pin noval (B9A).
• Heater: 6.3V at 300mA or 12.6V at 150mA (parallel or series wiring).
• Amplification Factor (Mu): ~100 (high gain, ideal for preamp stages).
• Plate Resistance: 60–80 kΩ (high, contributing to low noise).
• Maximum Plate Voltage: 300V.
• Typical Applications: Voltage amplification, phase inversion, and cathode followers. The tube's design emphasizes low microphonics and hum, making it exceptionally quiet for audio use.

Common Uses

• Guitar Amplifiers: Heart of the preamp section in classics like Fender, Marshall, and Vox models—handles gain staging for overdrive and tone shaping.
• Hi-Fi and Studio Audio: Preamps, equalizers, and recording consoles for clean signal boosting.
• Other: Phono stages, effects pedals, and even some vintage synthesizers. Its high gain allows for rich harmonics and dynamic response, but it can be prone to microphonics (ringing) in high-vibration environments if not selected carefully.

 This Sleeve of  tubes are new old stock, Tested, and guaranteed full emission.

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