The above suggestions are good.
If you are happy with your amp and don't want to spend a lot of money, Hemihorn, try JJ KT88 output tubes. They are sweeter than EL34 tubes, and you will pick up some other positive side effects. Power will increase 20 - 40%, both frequency extensions will be much more extended, but the bass will be night and day different.
However, if you find the KT88 to still not be up to your liking, it is probably due to the design of Modjeski. His priorities may be different than yours. While a great designer, different people have different tastes.
If you are not driving a VERY efficient speaker, I would second the Quicksilver recommendation. Use the JJ KT88 tubes that you will have already purchased. While I like the Cary V12, I am not a fan of the Rocket 88. That's just me.
If you are happy with your amp and don't want to spend a lot of money, Hemihorn, try JJ KT88 output tubes. They are sweeter than EL34 tubes, and you will pick up some other positive side effects. Power will increase 20 - 40%, both frequency extensions will be much more extended, but the bass will be night and day different.
However, if you find the KT88 to still not be up to your liking, it is probably due to the design of Modjeski. His priorities may be different than yours. While a great designer, different people have different tastes.
If you are not driving a VERY efficient speaker, I would second the Quicksilver recommendation. Use the JJ KT88 tubes that you will have already purchased. While I like the Cary V12, I am not a fan of the Rocket 88. That's just me.