Tube Amp Doctor 5751 HG Preamp Tube
This High Grade selection is of the highest quality with lowest noise (microphony, hum, hiss) level. Typically only 1-5% out of the whole production yield make it to meet the High Grade requirements.
The TAD 5751 High Grade is the first choice for vastly improving the clarity, smoothness, and vintage tone character of most guitar amps. It still has plenty of gain so if you have a high-gain preamp that does not have that classic crunch characteristic, the 5751 tube will work wonders. In hi-fi preamps and CD players, the TAD 5751 HIGHGRADE will lower noise floor and sound smoother and clearer in place of many 12AX7 tubes.