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Audio Tubes
Audio Tubes

A vacuum tube also called a electron tubes is a sealed glass or metal-ceramic enclosure used in electronic circuitry to control the flow of electrons between the metal electrodes sealed inside the tubes. The air inside the tubes is removed by a vacuum. Vacuum tubes are used for: amplification of a weak current, rectification of an alternating current to direct current (AC to DC), generation of oscillating radio-frequency (RF) power for radio and radar, and more.

According to PV Scientific Instruments, "The earliest forms of such tubes appeared in the late 17th century. However, it was not until the 1850s that sufficient technology existed to produce sophisticated versions of such tubes. This technology included efficient vacuum pumps, advanced glassblowing techniques, and the Ruhmkorff induction coil."

ELECTRO HARMONICS/SOVTEK/AI/12AU7(ECC81)
... 12AT7(ECC81)
12au7 audio tubes The development of the ECC81/2/3 double triodes was a major leap forward in the history of valves. All three of the variants in one way or another have been used in almost every piece of valve electronic equipment of all kinds.
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ELECTRO HARMONICS/SOVTEK/AI/12AT7(ECC82)
... 12AU7(ECC82)
12at7 audio tubes The development of the ECC81/2/3 double triodes was a major leap forward in the history of valves. All three of the variants in one way or another have been used in almost every piece of valve electronic equipment of all kinds.
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ELECTRO HARMONICS/SOVTEK/AI/12AX7(ECC83)
... 12AX7(ECC83)
12ax7 audio tubes The development of the ECC81/2/3 double triodes was a major leap forward in the history of valves. All three of the variants in one way or another have been used in almost every piece of valve electronic equipment of all kinds.
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ELECTRO HARMONICS/SOVTEK/AI/6922(ECC88)
... 6922(ECC88)
6922 audio tubes This 6922 tube type was rated the "best buy" by Vacuum Tube Valley magazine in their 6DJ8/6922 tube shootout. They cited a better bottom end and "less offensive" high frequencies as two of the reasons for their choice. This is also the same tube which is sold by Richardson's under the Bugle Boy brand name. Every tube has to meet our tough standards for low noise levels, which guarantees the best performance for preamplifiers.
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ELECTRO HARMONICS/SOVTEK/AI/EL34(6CA7)
... EL34(6CA7)
EL34 audio tube The new Electro-Harmonix EL34EH is extremely musical and predictable with a sound that is rich, smooth, and highly detailed without being edgy. It is the perfect EL34 for vintage equipment and a sure way to improve the performance of modern equipment.
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