Tube Amp, Preamp upgrades -- what did you do that improved your units?

Greetings! I've used the Odams in two SETs, a PP amp and a two stage DC coupled preamp as the output coupling caps so far (I still have them in the preamp as an alternative "flavor" to compliment a couple of amplifiers). They all have over 500 hours on them. With the exception of the preamp, I found that they sound congested in the lower midrange and upper bass even after burn in, but are very nicely extended on both extremes. The Miflex can sound forward in some circuits, and I've found sound best when there is only one coupling cap in the circuit (otherwise the upper registers tend to sound vague and lack focus). I recently ordered a dozen Miflex KFPM, which are copper coil and metalized poly and have been burning in a pair. They remind me of the Audyn True Copper, but with much better detail and extension and the same midrange body and texture. They present incredible delineation throughout the range, albeit I'm getting a little brightness on the top end which I'm hoping will smooth out with burn in time. Jeff at Sonic craft recommended these to me, and they are one of his bang for the buck favorites. In the end, not all components will produce the same results with the same upgrades and the overall system voicing will dictate what sounds best. Look at it as a chef's spices, and you'll realize not every recipe tastes good with the same blend. Best regards, Aric

@hilde45 - You're very welcome! I definitely wouldn't rule out the Miflex as there's many folks out there that really love them. I also wouldn't rule out Audyn True Copper, V-cap Odam, or many of the other fine capacitor upgrades that we have to choose from!

All the best in your endeavor, Aric

@grannyring With regards to Jeff selling what he carries- it’s just the opposite. He carries what customers want and expressed to me that even though he believes the KFPMs to sound better than the KPCUs, he has sold over 2,000 KPCUs and about 66 KFPMs. He keeps up with what there is demand for and is a stand up guy. I just wanted to address that point, the rest with regards to caps is opinion. All that matters is that you enjoy the music! Thank you for the kind words, and respect :-)

For clarity and to conclude my posting, my post is to offer alternative viewpoints in case the OP wanted to try something different. Considering the same issue is not there with other caps, I would rule out other variables. No intention of bumping elbows here.