Adding a Treble boost to an Opamp output ??

[Minion]

Hi Guys , I am just finnishing building a guitar amp , it is a 12ax7 Tube preamp with input and output opamp buffers with an active 3 band eq and a power amp (about 50w) and I notice that even with the treble cranked up it still needs a bit more high end and wanted to add some type of treble boost to the output opamp buffer ......

Can someone please explain how I might go about this ??


Thanx a lot ....