Tobias, yes, I forgot to mention that I'd also upgraded the power cord. I made up my own, using Marinco plugs and Belden 19364 wire. I had the cord when I bought the player and never used the stock cord at all so I can't compare the two.
On the opamps, Underwood HiFi uses the Burr Brown OPA-627 in their upgrade and Sound Odyssey uses the AD8066. There was no way to compare the two directly and the reason I bought the 8066 is that the price seemed reasonable considering the cost of the player. Sound Odyssey was set up to sell parts directly from their web site and that's the chip they use. I'm thrilled with the sound but the OPA-627 might be a good option, as well, though considerably more expensive. They sell it as well
Here's the page on their site with descriptions of the various opamps they sell. I'm sure their may be other sources, as well.
http://store.yahoo.com/yhst-9053161298275/opamps.html
On the opamps, Underwood HiFi uses the Burr Brown OPA-627 in their upgrade and Sound Odyssey uses the AD8066. There was no way to compare the two directly and the reason I bought the 8066 is that the price seemed reasonable considering the cost of the player. Sound Odyssey was set up to sell parts directly from their web site and that's the chip they use. I'm thrilled with the sound but the OPA-627 might be a good option, as well, though considerably more expensive. They sell it as well
Here's the page on their site with descriptions of the various opamps they sell. I'm sure their may be other sources, as well.
http://store.yahoo.com/yhst-9053161298275/opamps.html