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2. 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.

3. EL84 - Wikipedia

   en.wikipedia.org/wiki/EL84

   A single EL84 was used in low-cost equipment, and a push–pull pair for lower distortion and higher power. In common with all 'E' prefix tubes, using the Mullard–Philips tube designation, it has a heater voltage of 6.3V. It can produce 17W output in Class AB1 in push–pull configuration. Many guitar-amplifiers routinely run EL84 tubes in ...

4. 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 ...

5. Peavey Electronics - Wikipedia

   en.wikipedia.org/wiki/Peavey_Electronics

   Peavey's line of guitar amplifiers made specifically for blues, jazz, and classic rock players. The original Classic series amplifiers were introduced in the 1970s (and were originally called the Peavey 'Vintage' series which the first releases used 6C10 tubes in the pre-amp, NOT solid State. 6C10 amps have a Presence knob, not a Master.

6. 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.

7. Valve RF amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_RF_amplifier

   It therefore adds 1/10 of the noise power caused by the source, and the noise figure is 0.4 dB. For a low-impedance source of 250 Ω, on the other hand, the noise voltage contribution of the tube is 10 times larger than the signal source, so that the noise power is one hundred times larger than that caused by the source.