Tube headphone amp kit up to 300USD

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Corvette or Frigate

Headphone%20Amplifier%20Corvette%20Main.jpg
 
+2 on the crack. it's the best i've built in that price range. It's perfect for high impedance cans but if you are using low impedance cans you can increase the size of the caps in the signal section. If you search the bottlehead.com forum there is a chart for cap size changes with freq. response and plently of tweaking threads where people have adjusted the components to work with Grados and such
 
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