We engineered this item to sound amazing with these tubes. The sound is so clear and warm that you will never want to take your headphones off. All About Your TubeHead All About Your TUBEHEAD(45 Sec).
EVen prices on low $60, the sound is great. It produces the warm, cllear and loud sound like I never heard before from any other amplifier. Having two lamps exposed on the top of amplifier scared me at the begining, but I guess they rare more durable than they look. Design of this unit screams retro, from exposed lamps to taggle power switch. Everything is nicely label. So its very easy to connect. Consider that I seen dual lamp model going for two hundred dollars and up, this one is a bargin. Coupled with good set of headphones, like my HIFIMAN, you can have small studio in your home or apartment going. And its done on a budget.
I use the Sennheiser HD6XX which is the upper limits for resistance for this amp ad is has no problem driving them at all. Great sound as well, warm miss, the whole deal.
I have 250ohm Beyerdynamic professional earphones. This amplifier gives me the power those 250 ohms demand to produce the studio and recording room sound.