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2. 6DJ8 - Wikipedia

   en.wikipedia.org/wiki/6DJ8

   The 6DJ8 was designed for use as a low-noise amplifier in VHF and UHF TV tuners, an improved successor to the usual 6BK7, but due to its high gain it was heavily used in high-end test equipment, for example, most high-quality oscilloscopes from the 1950s to the 1960s utilize a number of 6DJ8 tubes.

3. 12AX7 - Wikipedia

   en.wikipedia.org/wiki/12AX7

   Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947. The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications. As a popular choice for guitar tube ...

4. 12AU7 - Wikipedia

   en.wikipedia.org/wiki/12AU7

   The tube is popular in hi-fi vacuum tube audio as a low-noise line amplifier, driver (especially for tone stacks), and phase-inverter in vacuum tube push–pull amplifier circuits. It was widely used, in special-quality versions such as ECC82 and 5814A, in pre-semiconductor digital computer circuitry.

5. Low-noise amplifier - Wikipedia

   en.wikipedia.org/wiki/Low-noise_amplifier

   A low-noise amplifier (LNA) is an electronic component that amplifies a very low-power signal without significantly degrading its signal-to-noise ratio (SNR). Any electronic amplifier will increase the power of both the signal and the noise present at its input, but the amplifier will also introduce some additional noise.

6. 6N1P - Wikipedia

   en.wikipedia.org/wiki/6N1P

   Current production 6N1P-EV tube (1999) branded with the original factory logo (right) and Svetlana brand name (left) The 6N1P (Russian: 6Н1П) is a Russian-made miniature 9-pin medium gain double triode vacuum tube intended for use as a line audio amplifier and cathode driver. Basic data: Uf = 6.3 V, If = 600 mA; μ = 35; Ia = 7.5 mA; S = 4.35 ...

7. Valve RF amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_RF_amplifier

   (This is the reason for the relatively high noise resistance of the EF86 in the above example.) Thus, tubes with low noise at high frequency do not necessarily have low noise in the audio frequency range. For special low-noise audio tubes, the frequency at which 1/f noise takes over is reduced as far as possible, maybe to approximately a ...