Inexpensive Tube Amps

I have a pair of Mirage OM 10 Towers that are 6 ohm and 91 db sensitivity.  Should not pose a problem for any of these.  Also have a pair of Castle Conway 3 Towers that are 8 ohm and at least 88 db sensitivity.  

@will62 None of these amps make enough power to drive speakers with efficiency as low as those in the quote. You would want 10X the power at a minimum.  A Dynaco ST-70 is a good suggestion and there are many versions of that amp available.

If YOU are referring to me, I know this is a different OP. Just informing him that I would not trust a cheap Chinese amp in the long run.
You get what you pay for.

I agree with @atmasphere , although I bow to his expertise.

As noted, many of those economical tube amps from Amazon are made in China. Not a bad thing, but I agree with @lowrider57 : 
the Yaquin is a cut above, also the Cayin's are very good. word has it their integrateds are based on the classic McIntosh designs.

You also have the option of a "DIY" tube kit. but Again, I would not buy indiscriminately on Amazon, but go to an audiophile site that sells them, like Bottlerocket or others out there now that are on their 3rd, 4rth, 5th, design iteration and getting better all the time. 

But as will all things audio: depends on your budget.
But if I were you, I would look for a used Cayin or Yaquin. You pay less, and if it doesn't work out, you can sell it on the used market for the same price you paid and you dont lose money.

I had a Bada for a while, a Chinese hybrid tube headphone amp, drive the bejesus out of my Sennheiser 600s, hence the hybrid. Dunno if they are still around, maybe.