Hi all! Long time lurker, first time poster.
After reading many reviews a few months back I purchased the Grado SR-125i's, as an upgrade for my Senn HD280s. For my budget, they're fantastic. I've used a BioScienceGeek cmoy for years with my Senns, but they were customized for 64Ω and 150Ω. This means I need more gain in order to power the 32Ω Grados.
Upon research it seems Little Dot amps are a great budget-minded foray into tubes. People seem to recommend the I+ (hybrid) for use with Grados because it can pound out more power to low-impedance cans.
Before ordering one this afternoon I looked around to find out what people thought of the tube options. The basic Chinese 6JI doesn't seem very highly regarded, and the other two options are a bit over priced (save for the convenience factor). After looking around I found that the Mullard M8100/6AK5 seems to be liked by a lot of people. I found some NOS, "military version," of them on eBay (item # 270629165066). Are these counterfeit? They're being sold from Taiwan. If not, anyone have any experience with these, versus the retail versions? 23USD for a pair seems fair, compared to some tubes out there. Thoughts?
Another question goes towards changing the opamp. Is everyone pretty happy with the included MC33078 or does it get swapped out often for other chips?
I'm pretty excited to start using tubes for the first time. The amp should arrive in a few weeks.