Tube Pre amp with tone control suggestions

I have a Luxman  CL-35 III. These were manufactured in about 1975. They sound good, but not as good as the CL-38. Additionally the CL-38 has built in SUT and a remote control.

Try using hifishark.com to search for it.

The  Schiit Loki is an add on which costs $149. I have never heard it and am in no way associated with it. But It may be a less expensive alternative. Another alternative MAY be  a subwoofer. However that depends on your speakers . IE, my speakers have very good mids and highs but lack bass. Generally I set the subs and forget them. But every now and then I just need to tweak the lows or highs. Too much bass kills the highs. Too little bass takes away the punch. But again, my system is at a good place where it works for me. Not sure it is for everyone, especially if you are fighting too much bass as it is.

All excellent suggestions. I have several Subs I have put in and out. Don't really want to go to sub route. I have a good sub and it definitely does add to it
, I have various speakers that I can use cornwall's tannoy mg12 a few others. I know none of these speakers lack the bass when being put to them. I will look into that $149 option.

The Schiit Loki is an excellent EQ, but can only be used in a single-ended setup. It is the most transparent analogue EQ I've ever heard. 

Interesting. My amps are single ended, Audio Note P4 mono block's, but I am not sure about the pre amp