Inexpensive Tube Amps


Anyone have any experience with the following?  I want to try one just to see how the sound compares to my Yamaha and Denon solid states.  Since the Denon is living on borrowed time I will likely have to replace it this year anyway.  Looking at the Nubsound and noted a Germtune that is identical to the Nubsound but costs a bit more.  Reviews are largely good including those on other forums.

https://www.amazon.com/dp/B00NWISSGU/?coliid=I2VYW63Z6R35ZH&colid=3O2PB0XPYIL0T&psc=0&re...

https://www.amazon.com/Nobsound-Amplifier-Single-Ended-Handcrafted-Headphone/dp/B073ZXZ3Z5/ref=pd_sb...

https://www.amazon.com/dp/B00DRUY6EG/?coliid=I1EPHIQ7T6OOPR&colid=3O2PB0XPYIL0T&psc=0&re...
will62
kalali. Thanks. Yeah, I am leaning towards what you suggested. The tubes are excellent from what I’ve read and they are easy to roll if necessary.

My A3 did drive my OM 10’s very well. They are 6 ohm and 91 db sensitivity. The Castle Conway 3’s were OK with that amp but I now have them paired with my old Yamaha A500 amp and there they shall stay. I bet the OM 10’s will be great with one of these little tube amps.

Wish I could biwire though.  The OM 10's really shine when bewired.  But will likely be more than happy with the sound of the tubes with them.
Oh well, just trying to offer an experienced and hopefully helpful viewpoint but your cute response makes me second guess. I know very well how the free market works as well Will. Again, good luck, it seems your query was looking for affirmation of something that you already decided, not other alternative options that may be more viable to someone on a shoestring budget. 
What I think most of you fail to grasp is that I have a limited budget for this.  If I had wanted to hear about alternatives then I would have asked specifically for advice or information about other brands or models.  I already did preliminary research and determined that these inexpensive imports offer most of what I am looking for at a fraction of the price.

I don't need people telling me to spend either several hundred or perhaps thousands on something like audio gear.  I already have to spend THOUSANDS of dollars on other electronic gear, home repairs etc.  Audio while important, takes a back seat to the other things as this stage.  

From where I sit the reading comprehension of some of you is below average.  Steering me into a direction where I have to spend money I don't have budgeted, I would like to avoid is not helpful at all. 
Tubegroover. My initial query was straight and to the point. I wanted to know about the three amps that I linked to. I don’t see any other request for additional information about any other amps.

Over the years I've found this board to have some knowledgeable and helpful people.  But when it comes to these little tube amps it is obvious I am dealing with people that are fairly prejudiced and also have not had experience with this gear and to compensate for that lack of experience, steer you off in another direction.