TAD 6550A-STR Redbase Premium Matched Single

NEW VERSION: Since Sept. 2010, the TAD 6550A-STR has been manufactured with a stronger and exceptionally pure anode material combination. In conjunction with the extended TAD burn-in and formating process, the 6550A-STR reaches an outstanding consistency and stability and outperformes even the 6550C -C-. This makes the 6550A-STR withstand even the most critical application like e.g. the Ampeg SVT. (Fits only without the tube retainer!) Smooth, liquid bass, natural sounding tone and a wide open character make this tube extremely popular for bass guitar amps and High End Hi-Fi applications. The ratings of the TAD 6550C-STR meet or exceed those of the classic 6550A tubes. It performs superbly in any application asking for 6550. All power tubes labeled Premium Selected have passed the following tests: - Plate Current (PC) and Amplification (TC) - Low Noise Test - Microphonic Test - Sonic Tests - Shock Tests - Listening Tests - Shorts & Leakage Tests