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2. Optical amplifier - Wikipedia

   en.wikipedia.org/wiki/Optical_amplifier

   An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics.

3. Optonica - Wikipedia

   en.wikipedia.org/wiki/Optonica

   Optonica amplifier (SM-3636) and tuner (ST-3636) from 1978. The Optonica brand was created and first launched by Sharp of Japan in 1975 to compete in the high-end audio market along with established brands such as Sansui Electric, Sony, Panasonic, Sanyo, Yamaha, Nakamichi, Onkyo, Fisher Electronics, Technics (brand), Pioneer Corporation, Kenwood Corporation, JVC, Harman Kardon and Marantz.

4. Optical parametric amplifier - Wikipedia

   en.wikipedia.org/wiki/Optical_parametric_amplifier

   An optical parametric amplifier, abbreviated OPA, is a laser light source that emits light of variable wavelengths by an optical parametric amplification process. It is essentially the same as an optical parametric oscillator , but without the optical cavity (i.e., the light beams pass through the apparatus just once or twice, rather than many ...

5. St. Louis Music - Wikipedia

   en.wikipedia.org/wiki/St._Louis_Music

   St. Louis Music (SLM) is a manufacturer and distributor of musical instruments, accessories, and equipment.SLM distributes products from over 260 music products industry brands, is the corporate owner of several string- and brass-instruments brands, and is the producer and exclusive worldwide distributor of Alvarez and Alvarez-Yairi guitars.

6. Ampeg - Wikipedia

   en.wikipedia.org/wiki/Ampeg

   Ampeg ("amplified peg") [1] [2] is a manufacturer best known for its bass amplifiers.. Originally established in 1946 in Linden, New Jersey by Everett Hull and Stanley Michaels as "Michael-Hull Electronic Labs," today Ampeg is part of the Yamaha Guitar Group.

7. Guitar amplifier - Wikipedia

   en.wikipedia.org/wiki/Guitar_amplifier

   There is a wide range of sizes and power ratings for guitar amplifiers, from small, lightweight practice amplifiers with a single 6-inch speaker and a 10-watt amp to heavy combo amps with four 10-inch or four 12-inch speakers and a 100-watt amplifier, which are loud enough to use in a nightclub or bar performance.