Overall, i'm extremely pleased with both the sound and build quality of this amplifier and it has already found a permanent spo...  Read More

Overall, i'm extremely pleased with both the sound and build quality of this amplifier and it has already found a permanent spot in my collection.  Read Less

As with most tube amps, distortion at higher levels is soft and more pleasant on the ear than solid state equipment, with the m...  Read More

As with most tube amps, distortion at higher levels is soft and more pleasant on the ear than solid state equipment, with the main effect being a softer low frequency range where most of the energy is required the meters are not very sensitive.  Read Less

My hope was something without added junk in the signal path for the cleanest, unmmodified sound possible.

My hope was something without added junk in the signal path for the cleanest, unmmodified sound possible.  Read Less

I was attracted to the pure simplicity of this amplifier-- one input, no tone or other controls other than the volume control a...  Read More

I was attracted to the pure simplicity of this amplifier-- one input, no tone or other controls other than the volume control and outputs for 4 or 8 ohm speaker connections.  Read Less

At the current price, i was expecting to have to re-tube the amplifier to get it to sound good but again, a pleasant surprise.

At the current price, i was expecting to have to re-tube the amplifier to get it to sound good but again, a pleasant surprise.  Read Less

Although that is something that most single ended vacuum tube amps do well which few solid state amps can pull off, it is rare ...  Read More

Although that is something that most single ended vacuum tube amps do well which few solid state amps can pull off, it is rare to get that at this price point.  Read Less

My amplifier arrived intact and well packed.

My amplifier arrived intact and well packed.  Read Less

Pros:1 - excellent construction2 - quad boxed (3 boxes plus the amazon shipping box)3 - beautifully finishedcons:1 - manual (ch...  Read More

Pros:1 - excellent construction2 - quad boxed (3 boxes plus the amazon shipping box)3 - beautifully finishedcons:1 - manual (chinese language only)2 - power cord (220v power cord supplied with 110v amp)3 - sloppy customs inspectioncomments:the bottom line is that this is a surprisingly good amplifier.  Read Less

They run in pentode ultralinear mode , class a (but people have installed switches to get them to run in tetrode mode - less po...  Read More

They run in pentode ultralinear mode , class a (but people have installed switches to get them to run in tetrode mode - less power but aparently purer sound)mine arrived well boxed, looked superb and i had it up and running in minutes.  Read Less

My amp is actually the boyuu a9 , which is sold by douk audio and may be rebadged as a nobsound, their other trade mark.

My amp is actually the boyuu a9 , which is sold by douk audio and may be rebadged as a nobsound, their other trade mark.  Read Less