I don't get it. Is that an RA-1 with exotic parts but the same basic layout? The picture I showed above is literally the inside of a Grado RA-1 pulled out of the wood casing. They used to sell used for about $150-200.
Again you could build your own with exotic parts and still end up MUCH cheaper than $850. It's an extremely simple circuit.
I'm thinking possibly this amp was released or designed before the advent of the C-Moy style amps and the designer did not know about the C-Moy types or did not know that the C-Moy and other portables would have become popular in the headphone world. Perhaps now the the RA 1 has become the step child of headphone amps?
Edited by Spareribs - 4/2/12 at 7:12am