I would say "yes".What aspects are you looking to change (warmer,more detail or ?).
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Tpsonic - just curious at this time. I recently added a Harmonic Technology Photon Digital IC between the transport and the dac. WOW! The entire audio spectrum sounds clear as as the proverbial bell. Now, I 'might' want to add a little mid-bass warmth while maintaining the HF - if that's at all possible. Since I'm unable to roll the output tubes, that leaves the phase splitter (NOS Dynaco/Telefunken) and pre-driver (re-branded RAM Tube Works).
What are the units sitting on? A spongy footer might do it??
The Tele is a little lean for my tastes.You might look at the Mullard 4004/M8137.These have the body/warmth with a little more "sparkle" to the top-end (as compared to the standard "ax").
If you can source a pair of the Shuguang G8/G9 triple mica 12 ax 7s,you would probably be happy and at a much lower cost.These are a little hard to find,as they have ceased production.What they produce now,I can't comment on (not heard).