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2. Valve audio amplifier technical specification - Wikipedia

   en.wikipedia.org/wiki/Valve_audio_amplifier...

   Almost all audio preamplifier circuits are built using cascaded common cathode stages. The signal is usually coupled from stage to stage via a coupling capacitor or a transformer, although direct coupling is done in unusual cases. The cathode resistor may or may not be bypassed with a capacitor. Feedback may also be applied to the cathode resistor.

3. Valve amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_amplifier

   6N3C power tube. A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal.Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s.

4. List of car audio manufacturers and brands - Wikipedia

   en.wikipedia.org/wiki/List_of_car_audio...

   This list of car audio manufacturers and brands comprises brand labels and manufacturers of both original equipment manufacturer (OEM) and after-market products generally related to in-car entertainment that already have articles within Wikipedia. While components sold by these companies have much in common with other audio applications or may ...

5. Preamplifier - Wikipedia

   en.wikipedia.org/wiki/Preamplifier

   An example of a typical high-end stereo preamplifier. A preamplifier, also known as a preamp, is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker. [1]

6. Gain compression - Wikipedia

   en.wikipedia.org/wiki/Gain_compression

   It is more common in tube circuits than transistor circuits, due to topology differences, possibly causing the differences in audio performance called "valve sound". The front-end RF amps of radio receivers are particularly susceptible to this phenomenon when overloaded by a strong unwanted signal.

7. 807 (vacuum tube) - Wikipedia

   en.wikipedia.org/wiki/807_(vacuum_tube)

   The 807 also found some use as a horizontal output tube in early TV receivers, particularly those manufactured by DuMont. The 807 design (with some "value engineering" to reduce production cost) was the basis for the first application-specific horizontal sweep tubes such as the 6BG6G and 6CD6G.