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Desktop Power Amp
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For desktop-sized amps, you will be looking for modern, high-quality class D amps that use Pascal or Hypex modules -- needless to say, the AudioEngine is junk. Amps from D-Sonic or Red Dragon to name of few low-cost Pascal and Hypex manufacturers. Another alternative are Tri-Path (ie, class T) amps you can find from China (eBay, hifi-exquis.com, shenzhenaudio.com, etc) but I do NOT make any claims about their sound quality. Class A = forget about it and that price range and size. Class A/B = very untrustworthy at this size.
If you can find the desk area, the best bang for your buck would probably be a Chinese DHT (Direct-Heated Triode). I'll have to insist on a DHT like 2A3 or 300 (845/211 are probably too big and heavy for desktop use). The reason for this is because a DHT SET (Single-Ended Triode) are easy to implement and will provide the best available sound quality anywhere near that price point.
So, to sum up:
DHT SET (2A3, 300, 845, 211, etc) = BEST
Modern class D (Hypex, Pascal) = GOOD
Tri-Path class T = MAYBE GOOD ENOUGH?
Class A = Not good at this price range and size!
Class A/B = Can't be trusted at this size!
Mass consumer grade class D = TRASH
Non-DHT / pentode tube amps = INFERIOR TO DHT, the little baby ones are a joke - AVOID.