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However, tubes are still used in several specialized applications such as guitar amplifiers (also called a valve amp outside the U.S.) and high power RF transmitters, as a display device in television sets and in microwave ovens.“The Supro Ozark features the powerful Valco string-through pickup at the bridge,” Ivankovich says.“It's most famous for being Hendrix’s first electric guitar.The simplest vacuum tubes resemble incandescent light bulbs in that they have a filament sealed in a glass envelope which has been evacuated of all air.When hot, the filament releases electrons into the vacuum: a process called thermionic emission.the color is the starburst color is very similar to the Havana with the spanish neck. The vinyl pickups are usually found on electrics around 1952/55.This scratchplate was used mostly on the Supro version of this instrument - The "Supro El Capitan".

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He worked at National, and later at Dobro, and was largely responsible for the production methods that made it possible to mass-produce metal and Bakelite guitar bodies.

We do know this much: Before there was Valco, there was the National Stringed Instrument Corp., a California-based manufacturer of resonator guitars dating back to the ’20s, and the Dobro Manufacturing Co.

National created steel-bodied guitars, notably the “tri-cone,” which used three resonating metal cones to amplify the sound, and the “biscuit,” which featured a single resonating cone.

Vacuum tubes, or thermionic valves, are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope.

Although the envelope was classically glass, power tubes often use ceramic and metal.