[JahJahBinks]

Are design using discrete transistors generally better than those using op-amps? What's the case in the head amp on the market today? Most $500+ headamps don't use op-amps right?

 

[Wodgy]

There are arguments on both sides of the issue. Discrete designs can be specifically designed for headphone amp purposes, but transistors in op-amps are laser-trimmed and thus more carefully matched. Only the Gilmore and Perreaux amps are completely discrete. The PPA, Emmeline HR-2, Corda Prehead, Headroom Max and Blockhead are all either op-amp designs or hybrid op-amp/discrete designs.

 

[tangent]

A very popular design pattern is an op-amp used as the input and gain stage wrapped around a discrete buffer. This gives high output current and high accuracy. The high output current means lower distortion and modest currents, and better bass handling. The Creek OBH-11, most of the Headroom amps, the Chiarra, and experimental versions of the PPA do this. Probably there are others.