How to identify tube amp


I just received a pair of mono blocks that don’t have any branding or identification.  It didn’t come with tubes so I’m not sure what tubes to buy for it!  How do I identify who manufactured the amp and/or figure out what tubes to get for it?
128x128surfersf

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This surfer dude is messing with you boys. Cryptic photos that
don't show the whole product. Did these mono blocks arrive by carrier pigeon? 
-Skeptic