Please answer for dummies: Any way to increase power from a Chinese tube amp?


I decided to set up a second audio system in my bedroom mostly to learn and play around with.  Initially I had an old Marantz receiver but became interested in some of the Chinese knock-offs.  I bought a pair of the Mistral "LS3/5a" speakers and was pleased with them for the price.  Then I decided to see what a vacuum tube amp sounded like and bought a Chinese tube amp (Reisong 12 watts per channel).  I like that too except that now I am wanting to play it louder and some sources seem to have less volume than others.  So...I was wondering if there is anything I can do inexpensively that would would work with the Chinese tube amp to give it more power.  I listen to everything from classical to 70s rock to jazz and country and I mostly either stream from Amazon Prime via a Sonos Connect or play vinyl on my Teac TN300 with an Ortofon 2M Red or listen to an occasional CD on my Denon DCD 620.  I am nearly 80 and can't afford to purchase new audiophile level pieces. And did I say that I do not understand most of what I read on these threads so write simply.
mdpc
More horsepower (watts/voltage) needed for those low-sensitivity Mistrals! Look for a used NAD or Proton integrated amp. They can often be found for not much money! I paid $50 for my Proton - and sounds as good as any four-figure amp. Good engineering costs no more than bad engineering!
There is no way to get more watts/volts out of your Ch*nese tube amp. Of course you could ditch the Mistrals and get a pair of Altec Valencia's (owned a pair myself!). But these would be out of your budget.
@mdpc - Do any of the sources attached to the second system generate enough volume for you? What are your source components? Which ones don't generate enough volume?

You may need more efficient speakers, or you may need more power. However, if some sources are OK, there may be some other issue.
@reubent  "Do any of the sources attached to the second system generate enough volume for you? What are your source components? Which ones don't generate enough volume?  

Actually the turntable and CD player generate plenty of volume but I guess I have been streaming more recently and that pushes it.  I have the volume control on the Amp and the volume control on my iPhone Sonos app and both have to be at near maximum sometimes.  That provides enough volume but I have been unsure what downside may come from having both volumes near max.