Should I eliminate my preamp?

Thanks for all the comments.  As for the preamp, I have owned for 20 years. I purchased from a friend who was an authorized AR technician. He replaced tubes at the time I bought it. I am certain it couldn't hurt to have it tested, however I am trying to sell the SP6.

@audioconnection +2.  You need to think about the quality of the electronics involved, as well as issues like impedance matching. Use your ears, but it's extremely likely you'll prefer avec pre-amp.

You need to listen to it both ways. I have a DIY model that has bit perfect volume built in. Meaning I should be able to use the volume on my laptop and the dac continues to produce bit perfect sound to my amp. I have driven my amp with this dac as well as 2 others, but when I run the dac through my Coda preamp, Everything improves. For me the Preamp Stays

Ralph Karsten (Atma-Sphere) has in a few threads here lately discussed the issue of the benefits of an active pre-amp in certain system set-ups vs. the penalties. If you can find them in the Audiogon Forum, you will learn all there is to know on the subject. Ralph really covers all the trade-offs involved between the two approaches, providing all the facts necessary to help one decide which approach is better for a given system.