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2. Onkio Haus - Wikipedia

   en.wikipedia.org/wiki/Onkio_Haus

   Onkio Haus Inc., also called Onkyo House (株式会社音響ハウス; Kabushiki-gaisha Onkyō Hausu), is a company that operates sound recording, mixing and mastering studios in Ginza, Tokyo, owned by Magazine House, Ltd. and others.

3. Valve amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_amplifier

   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 vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   A compactron used in television sets to supply power to the anode of the picture tube. This tube is very rare, and very special, because it implements an indirectly heated cathode, not connected to the filament. No data is found on this tube, except for the filament power (which is 3.6 volts, 0.225 amps) and the base (which is the 12GQ type).

5. Mesa/Boogie - Wikipedia

   en.wikipedia.org/wiki/Mesa/Boogie

   Smith was building a preamplifier for Lee Michaels, who needed a pre-amp to drive his new Crown DC-300 power amplifiers. Smith added an extra tube gain stage to the preamp, with three variable gain controls at different points in the circuit, in what is now called a "cascaded" design.

6. 12AX7 - Wikipedia

   en.wikipedia.org/wiki/12AX7

   12AX7 (also known as ECC83 [1]) is a miniature dual-triode vacuum tube with high voltage gain.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.

7. 6N3P - Wikipedia

   en.wikipedia.org/wiki/6N3P

   6N3P vacuum tubes USSR. The 6N3P (Russian: 6Н3П) is a Russian-made direct equivalent of the 2C51 medium gain dual triode vacuum tube.It may be used as an amplifier, mixer, oscillator or multivibrator over a frequency range AF through VHF.