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Vacuum tubes, which date back to the 19th century, are a very interesting old technology. While they've been replaced by newer solid state technology in most applications, they are still prized in music where they are found in fine amplifiers for guitars and other instruments and in power amplifiers for musical reproduction.
The Western Electric 300B is a classic power tube that sounds great and gives off a beautiful blue and red glow when it's running.
Thanks for looking!
Western Electric 300B Nikon D800 Nikkor 105mm 2.5 ais & pk-13 10s f2.5 ISO 100