TELEFUNKENBlack Diamond ECC83-TK Vacuum Tube Matched Pair

I replaced factory tubes in my ART MPA II preamp and there is a noticeable difference to me. Much warmer and added presence. Its a much more of a full sound than before. If you aren't looking to buy new tube equipment, try replacing the tubes with these to at least get the most out of what you have and spend way less.