Have you considered aiyima a07? You can swap out the opamps (2 duals) to use the rest of the budget and get a more musical experience.
Pass ACA-mini if you don’t mind DIY and either have efficient speakers or don’t plan on running a party from your desk. ~6 watts per channel class A, 5" X 5" footprint. Should be available soon for less than $200. I’ll be getting one to hold me over until the is F5 done 
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Its only 3w @ 8ohm? I know 3 or 4 people that love it for sus so im kinda suprised its that low
Never even thought to try it TBH.
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Pure wattage number doesn’t say much. The amount of voltage and current matter.
Apart from power, there are obviously a lot of other attributes that define how an amp sounds with a given speaker/headphone.
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Looking at the site they all use 8200. Idk what tge difference is between that an yours but 2 of the 3 (had to count it up) got rid of stuff like 13r and others in favor of the elekit for sus, so maybe worth a shot since you have it on hand.
Oh, ofc. Jyst a fair general rule i go off of is under 4W at 8 ohm likely won’t leave a ton of head room as a general rule (especialy considering cheap shit often posts instant peak and not rms load as “max”). That said, I do know power output og transformer coupled tube amps can be wierd so 
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The 8200 is a 6l6 amps can use EL34/KT88’s, it’s going to be closer to 10W@8Ohms with those.
The 8150 is a 6V6 amp, which is specifically why I bought it, but i guess it doesn’t hurt to plug into it. I need to look at the wiring diagram, to see if the if the headphone out is attenuated, in which case I’d need to use the speaker taps.
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I asked one of them and he uses speaker taps cause the HP out is over 200 ohm OI for some reason