300B Valves

300B tubes and valves. Available as singles, matched pairs, and quads. Tested in-house to top standards. 180 day warranty.

  • JJ 300B sitting on AVO tester image

    JJ 300B Matched Pairs & Quads

     From £278.94

    Ultra-long life, high-quality construction and superior sonics with improved performance make the JJ 300B a top choice over other 300B valves. We accurately match each set in-house for anode current and provide our test results on a certificate in the box.

    Made by JJ Electronic in Slovakia. Tested in-house.

    180 day warranty.

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