Thanks, it must be a phone thing as I have no issues on the desktop.
There are some really great amps coming out of China but they are mixed in with the junk. I always replace the Chinese tubes with North American or cold war era Soviet versions.
The Chinese IEM (In Ear Monitor) market is the one that has really come a long way with excellent earphones, most of them in the sub $100 and $50 range.
Feliks Audio is a relatively new tube amplifier manufacturer out of Poland with some very reasonable and well made products.
Feliks Audio