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Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, 100 or 210-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products ...
The transmitting tubes TT21 and TT22 have almost identical transfer characteristics to KT88 but a different pinout, and by virtue of their anode being connected to the top cap have a higher plate voltage rating (1.25 kilovolt) and a higher power output capability of 200 watts in class AB1 push–pull.
For most audio applications more power is needed at low frequencies. This requires a high-power amplifier for low frequencies (e.g., 200 watts for 20–200 Hz band), lower power amplifier for the midrange (e.g., 50 watts for 200 to 1000 Hz), and even less the high end (e.g. 5 watts for 1000–20000 Hz).
In 1959, Harman Kardon marketed the Citation II, an early ultra wideband stereophonic tube amplifier. It featured 60 watts/channel output with a frequency response of 18–60,000 Hz at 20 watt output. [20] The company promoted their philosophy of designing high fidelity sound using amplifiers that provided widest possible audio bandwidth.
The I/C100 Organ/Musical Instrument Amplifier, which gave a massive 100-watt RMS of undistorted power and featured a unique green electro-luminescent lit front panel which was to become one of HH's unique selling points, was produced with musicians (especially the semi-pro) and the retail music equipment market in mind. The separate 412BL [4 x ...
A large number of full-range drive units are used in commercial sound systems, which may employ a number of 200 mm (8") full-range drivers, mounted into suspended ceilings or small 'back-box' enclosures. These convey background music and announcements to workers and visitors in retail stores, and public spaces. While these drivers are classed ...
With American 807 or British KT66 valves (Williamson recommended the latter type [61]) and specified power supply the amplifier delivered 15 watts of output power. Further increase in output, according to Williamson, required use of four output valves; his 1947 article mentions construction of a 70-watt prototype. [58]
Audio amplifier power ratings are typically established by driving the device under test to the onset of clipping, to a predetermined distortion level, variable per manufacturer or per product line. Driving an amplifier to 1% distortion levels will yield a higher rating than driving it to 0.01% distortion levels. [ 14 ]