"The inputs are what I'm most interested in"
Are the Sovtek 12AX7's the AX or the LPS version? Generically speaking the LPS version isn't far off from the tone you are looking for, i.e. open mid range - brighter highs, but how it combines with the EH power tubes, I don't know.
Another recent production tube for open mid-range and brightenened highs is the EI12AX7E (grey plate) if you can find them. A candidate which is easy to find is the Tung-Sol 12AX7. The Tung Sol has a bit more bass than the others.
Reconsider the power tubes you are using. I've found what you are looking for in SED KT88's or the more linear SED 6550. But there are a lot of options! Gold Lions are highly though of. I like the Tung Sol 6550's which are similar to the SED 6550's but with more bass/warmth.
Now for an unconventional recommendation. Based on my present use of them, SOVTEK KT88's. Excellent mid range and highs. Clean, clear, linear but not hyped up to impress. But a tad short on deepest bass but otherwise excellent. Not expensive. Rugged. Unless your amp is already short of bass and you need to plump it out or you are a loud bass person, these tubes can really do the job.
A caveat however, you may still want to change the small tubes to dial in the exact tone you want once you have decided on power tubes.
Are the Sovtek 12AX7's the AX or the LPS version? Generically speaking the LPS version isn't far off from the tone you are looking for, i.e. open mid range - brighter highs, but how it combines with the EH power tubes, I don't know.
Another recent production tube for open mid-range and brightenened highs is the EI12AX7E (grey plate) if you can find them. A candidate which is easy to find is the Tung-Sol 12AX7. The Tung Sol has a bit more bass than the others.
Reconsider the power tubes you are using. I've found what you are looking for in SED KT88's or the more linear SED 6550. But there are a lot of options! Gold Lions are highly though of. I like the Tung Sol 6550's which are similar to the SED 6550's but with more bass/warmth.
Now for an unconventional recommendation. Based on my present use of them, SOVTEK KT88's. Excellent mid range and highs. Clean, clear, linear but not hyped up to impress. But a tad short on deepest bass but otherwise excellent. Not expensive. Rugged. Unless your amp is already short of bass and you need to plump it out or you are a loud bass person, these tubes can really do the job.
A caveat however, you may still want to change the small tubes to dial in the exact tone you want once you have decided on power tubes.