Finally getting back on this tube after using this for a short time. I've been trying to find actual new tubes to put in my crack, and have tried a Electro-Harmonix, J&J Tesla and finally this Tung-sol 6189. I've had so many problems with old stock tubes being micro-phonic that I'm just trying to find a good combination of new ones. This 6189 is the best of all the ones I've tried. The EH tube is good, my sound memory of this is that it's less dynamic, the J&J tube pushed the highs too much for my taste. All the time I'm using 6h13C in the drive socket, which to my ear does not sound as good as my old stock 6as7g or 6080, but it's dead silent and no micro-phonics. The outside of the box for the 6h13c appears to be stamped 1985. So for the moment my crack has an all Russian Lineup. If anyone has suggestions on possible new stock 6080 tubes let me know, I have not seen any aside from the "winged C" 6h13C I've got already. I tried a NOS 5998 (two actually) from a retailer, they were a definite step up, but just looking directly at the crack caused it to buzz. I sent them both back to my dismay (using the 6189 up front). That's a bummer man.
Ron