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The 833 (FU33) Vacuum Tube in High-Fidelity Amplifiers
Although originally an RF tube, the 833 has been embraced by audiophiles for its majestic and full-bodied sonic presentation. As a directly heated triode, it retains the typical “tube flavor”: warm, lush midrange and smooth harmonic distortion. Thanks to its enormous reserves, it provides effortless drive and explosive dynamics, easily handling large loudspeakers. For example, some audiophiles remarked that the FU33 (833) tube delivers “excellent tonal quality, strong spatial imaging, powerful Class A output, and superb control” . Reviewers also note its tonal balance across highs, mids, and lows, combining triode charm with authority and dynamic scale .