How to identify tube amp

This begs the question if you just received them who/where did they come from? Did you purchase them? If so did the seller not identify the amps or give any details?

Also looking at the pics I see two spots for input tubes and two for output tubes which implies the amp is single ended. You can start there classic single ended tubes would be 300B, 2A3, 45. There are certainly instance of single ended amps using a variety of other tubes EL84 and EL34, KT88. Perhaps someone can better tell by the tube sockets I cannot.

@jond
Why would you think they are single ended? I’ve owned Quicksilver mono amps that were push pull that looked similar to those!

Ah I just noticed they are monoblocks! You're right @yogiboy I was assuming it was a stereo amp!

They might be early Quicksilvers!
http://quicksilveraudio.com/products/sixty-watt-mono-amp/