Correction--I now am using a Mullard GZ34 fat base rectifier tube. I thought that I had the metal base installed when it was the fat base. It is not as sweet as the metal base, but better over all. I would add that the H3000 modification changes the gain selection to 20, 24, 26, & 30 Db...
After talking to David Beetles (Hammertone Audio) about the upgrade available for the H3000, I had Albert Porter (PorterHouse Audio) up grade my H3000. David described the improvements as "greater dynamics, wider bandwith and soundstaging abilities", Albert's description was similar. My...