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Sylvania first began manufacturing vacuum tubes in the 1930s. These tubes were used in the early ham radios, home radios, amplifiers, and prototype electric instruments. The 12AX7 Sylvania tubes are known for their long plates. The long plates allow for improved microphonics and support crisp and clear radio transmissions. Because of the extended length of the plates, this tube is able to act as an amplifier. The plate allows the 12AX7 to amplify sounds and noise by as much as 100 times. This increase in plate length allows older radios to deliver a greater level of sound even without a separate amplifier. The longer gray plates also minimize harmonic distortion of the sounds coming from vintage audio equipment. The plate in these matched tube sets measures about 1.1 inches long and 0.05 inches in thickness. This 12AX7 Sylvania tube also features a pair of copper grid posts. This pair of posts connects the plate to the screen grid. With the pair of copper posts, more electrons are able to flow toward the cathode and power the acoustic system. The anode voltage is about 250 volts. The anode's current is about 1.2 mA. The rare Sylvania 12AX7 stock vacuum tube is utilized for transmitting audio. It is ideal for the replacement of JAN Sylvania 12AX7WA in vintage equipment. It also delivers an accurate sound for today's modern Hi-Fi radios and musical instrument amplifiers. This rare product also has a halo or D getter. The D getter provides the tube with low-level voltage amplification for radio frequencies. Some musicians and audiophiles like to stock up on these rarities for backups. The Sylvania 12AX7 stock tube is built upon a dual triode network. The dual triode consists of the high-value plate resistor, which has an impedance of 100,000 ohms. These products also have a cathode resistor that is designed to provide grid bias. The grid bias is important for optimizing the timing and directional flow of electrons. When the resistor is bypassed, this unit has a voltage gain of about 60 volts. Its amplification of noise almost doubles the voltage gain and helps make it an excellent amp for use in early to mid-20th-century equipment. You’ll enjoy the good quality of sound that these Sylvania 12AX7 tubes produce when used to restore old RCA console televisions. Additionally, these vintage matched tubes are also ideal for use in RCA and Mullard radios and communication devices from the 1930s to the early 1980s. This is because they can be wired in series or in parallel. This flexibility makes these products ideal for a variety of equipment manufacturers. They are used as stock replacement units in RCA and Mullard phone systems. RCA, Siemens, and Mullard also used them in some early computers. These products are designed to emit a low level of noise while they are in use. This is because they are heated indirectly and produce minimal vibration. The minimal amount of noise means that you hear the radio frequency that is tuned. The low-frequency amplification allows you to focus on the good music rather than a static or humming noise. The tube measures 2.2 inches tall and 0.8 inches in diameter.

Product Identifiers

Brand
SYLVANIA
Model
12AX7
eBay Product ID (ePID)
168137360

Additional Product Features

Type
12AX7

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Sylvania 12AX7- Vintage Tube

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Additional Product Features