I have the JJ E34L's in mine and have been very happy with them.
I feel that the EH tubes are really good in guitar amps, but prefer the JJ in the Dynaco. notice that these are E 34 L not EL 34- so they draw a touch more current. Mine started sounding pretty good after about 10 hrs. They didn't sound BAD at first , just started to open up after ten hours.
If you want to go the 6l6 route, I would definitely go with KT-66's. The KT designation specifically refers to "Kinkless tetrode" which means that they were designed to remove a "kink" that was present in the frequency range of the 6l6.
I feel that the EH tubes are really good in guitar amps, but prefer the JJ in the Dynaco. notice that these are E 34 L not EL 34- so they draw a touch more current. Mine started sounding pretty good after about 10 hrs. They didn't sound BAD at first , just started to open up after ten hours.
If you want to go the 6l6 route, I would definitely go with KT-66's. The KT designation specifically refers to "Kinkless tetrode" which means that they were designed to remove a "kink" that was present in the frequency range of the 6l6.