I heard the Amperex's in the Dodd and thought they were great. I use them and Siemens in my Art Audio Alana pre.
Have you tried switching left and right? With the Dodd only using half the triode in each tube, you might notice a difference if one of the sides is a little off. Cost = 0.
It does sound like it could be weak tubes though. I have an amp that was starting to sound a little flat. I changed the output tubes, no luck, changed rectifiers, no luck. It uses 6922's and 12bh7's in the driver/gain stage, replaced them, bingo. All the dynamics/transients were back and it was day and night, not audiophile split hairs different.
I think you'll like the 7308's when you get them.
Have you tried switching left and right? With the Dodd only using half the triode in each tube, you might notice a difference if one of the sides is a little off. Cost = 0.
It does sound like it could be weak tubes though. I have an amp that was starting to sound a little flat. I changed the output tubes, no luck, changed rectifiers, no luck. It uses 6922's and 12bh7's in the driver/gain stage, replaced them, bingo. All the dynamics/transients were back and it was day and night, not audiophile split hairs different.
I think you'll like the 7308's when you get them.