Dennis,
The tubes in my Syrah were as follows; Raytheon 417A's, Mullard 6GK5's, Sylvania 6SN7's, RCA Black Metal 6L6's, and a Phillips Miniwatt GZ34 rectifier. It sounded great, it's just that the Herron seems to have a lower noise floor. Also the volume control is far superior, which I think helps with that lower noise and slightly better transparency. The tubes in the Herron right now are stock, I've only had it about three weeks, so it might get even better. Also the build quality is a lot better that the Syrah, a beautiful preamp but not the most sturdy.
The tubes in my Syrah were as follows; Raytheon 417A's, Mullard 6GK5's, Sylvania 6SN7's, RCA Black Metal 6L6's, and a Phillips Miniwatt GZ34 rectifier. It sounded great, it's just that the Herron seems to have a lower noise floor. Also the volume control is far superior, which I think helps with that lower noise and slightly better transparency. The tubes in the Herron right now are stock, I've only had it about three weeks, so it might get even better. Also the build quality is a lot better that the Syrah, a beautiful preamp but not the most sturdy.