(2) jj 5751 Tube Lower Gain 12AX7 - Tube Amp Doctor Sourced / Matched Pair
Manufactured in Slovakia, Highly desirable. The 5751 is lower gain (u=70) than the 12AX7 (u=100) and is used but manufacturers such as Conrad Johnson. Checked for noise and micro-phonics as well. JJ 5751 We are an Authorized Dealer.