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The later MKII and MKIII models have 4 channels to meet the varied input needs of musicians. While the amp's output provided larger sound than the Vox AC30, the tube design called for two EL34 output tubes to achieve the power needed for tonal clarity. The preamp tubes were consistently one ECC82 (12AU7) tube and three ECC83 (12AX7) tubes.
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.
Fisher Allegro Model X19 Tube 20 watt stereo amplifier and matching FM Multiplex Tuner, c. 1962 Fisher Marketing Brochure and Component Price List circa 1964 Fisher Custom Electra Console – 1967 – Model E-492-W – 21-R Solid State Chassis – 45 Watts – Made in US – Turn Table: Dual 1010 (W. Germany).
Vox's original flagship amplifier was the 15-watt AC15, powered by a pair of EL84 tubes, an EZ81 rectifier, an EF86-driven "Normal" channel, an ECC83-driven "Vib-Trem" channel. After the AC15 proved too weak to be heard over the screaming fans at Cliff Richard 's concerts, Hank Marvin asked Vox to build a "big brother".
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.
Panasonic Lumix S1R with prime lens 50 mm f/1.4 at Photokina in September 2018. On September 25, 2018, Panasonic became one of the founding members of the L-Mount Alliance, and announced two full-frame mirrorless cameras and a range of L-Mount lenses to be launched in 2019. [92]
The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.
lumen per watt: lm/W: M −1 ⋅L −2 ⋅T 3 ⋅J: Ratio of luminous flux to radiant flux: Luminous efficacy (of a source) η [nb 3] lumen per watt: lm/W: M −1 ⋅L −2 ⋅T 3 ⋅J: Ratio of luminous flux to power consumption Luminous efficiency, luminous coefficient V: 1: Luminous efficacy normalized by the maximum possible efficacy See also: