Headphone amp newb needs help

You can't really tell much about it without seeing the insides.

However I can tell you the gain is a little to high for those cans.
(The only reason I mention that is because those volume controllers suck on the lower part of their range)
 
misterX can make you a quality one for the same price. Dont gotta worry about it sounding good or if the build quality/part selection sucks.
 
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