9AU7 RCA NOS USA
5751 RCA USA, NOS
double mica, black plate, made in the 1960s
This RCA black-plate tubes are considered to be the best sounding tubes of its type. They provide a very detailed tone, full of warmth and a remarkable three-dimensionality
Lower Gain ECC83 type tube. great for clean tone with mild top end compared with "regular" ECC83/12AX7
Pro's choice for improved Fender Clean-Tone
