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First produced in 1938, RCA 63K7 vacuum tubes are a valuable part of musical history. Jazz and the blues were starting to come into their own as genres. Artists like Ella Fitzgerald and Billie Holliday produced albums that were in high demand. People would sing along as songs from these vocalists were played on the radio. It was around that time that Les Paul created the first solid-body electric guitar that would revolutionize the music scene. Frank Sinatra and Bing Crosby gave voice to the pop music of the time, while Glenn Miller put his touch on the big band phenomenon of the era. It's no surprise, then, that the collectors of vintage audio pieces adore RCA tubes and sockets. Audiophiles who prefer listening to classic recordings and modern tunes using the flair and quality of past sound equipment also value these tubes for their high-definition sound and distinctive warmth and clarity.The 6SK7 classic tubes and sockets feature the trademark black plating and the RCA logo. They have O-getters and will be just as durable and reliable now as they were when originally manufactured. The 6SK7 tubes feature a voltage-current rating of 6.3 volts, or 0.3 amperes. This allows for easy testing using a standard metering device. While small, these tubes will easily provide enough power in your amp or radio to produce clear trebles and deep, rich bass notes. The new old stock, or NOS, vacuum tubes reduce unwanted noises such as hisses and pops. With a low vibration rate, what was recorded is what you will hear. These tubes give you a great way to replicate vintage music sounds.Modern amplifiers, preamps, and radio accessories have mostly switched to solid-state methods of amplification. However, vintage vacuum tubes are still highly sought-after for musical applications. The classic 6SK7 tubes are rare finds, and it never hurts to stock up and save a few for when the need arises.You can save time when you need a 6SK7 replacement in your amp by switching out the parts yourself. After removing the old tube, snap the new tube into place using the pins on the bottom of the socket. Be sure to handle the 6SK7 tube only by the socket. Check that it is secure, and replace the screws removed to expose the original socket. Power the amp or preamp back on, and enjoy the fresh sound.If you’ve been careful in selecting powerful amplifiers, preamps, instruments, and other accessories for yourself, chances are that you want a reliable tube that will last. These 6SK7 tubes and sockets are the real thing from RCA, so you can have confidence in their quality. These 6SK7 components are powerful and produce solid levels of audio, but they are surprisingly small. With a height of just about 5 inches, they are easy to store for future use. They are lightweight and small enough so that you can bring a pair with you or keep a spare set in your bag of musical accessories and supplies.