I recently obtained a box of old tubes, many have been used, but was told most were working, just changed as maintenance. There are many assorted makes of pre tubes, Fender, GE, Sylvania, RCA, Sovtec,(even Honeywell). Among the ECC83's,12AX7's 7025's,12AT7's,and12AU7's, is a sleeve of JAN 5751 that appear NOS. I'm going to try some in my DR clone in V1, V2, and V3, thinking I'll benefit from lower noise, higher headroom, and a less aggressive reverb. Has anybody tried this tube? Comments?