The TAD Selected 5751 (RT009) is the first choice for vastly improving the clarity, smoothness, and vintage tone character of most guitar amps! They still have plenty of gain so if you have a high-gain preamp that does not have that classic crunch characteristic, the 5751 tube will do wonders. In hifi preamps and CD players, the TAD Selected 5751 will lower noise floor and sound smoother and clearer in place of many 12AX7 tubes.
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