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Capacitors for HP filters in tube amps recommendations?

I’ll soon be installing a capacitor on each of the input jacks of two tube power amps, to create passive 1st-order high-pass filters. Cap values are 19.9uF (20uF will do) and 30.33uF (let’s say 30uF). I’ll need two of the former and four of the latter (balanced/XLR input jacks), and I don’t want to spend more on the caps than the amps cost me ;-) .

I’m all ears for nominees. I don’t need or want any flavoring, "just" neutral transparency. The amps are powering fairly transparent loudspeakers (ESL’s, and Magnetic-Planars with Ribbon tweeters), which will pretty well reveal the character of the caps. In spite of that fact, "most-bang-for-the-buck" nominees are of particular interest, not cost-no-object ones. Thanks y’all.

128x128bdp24
rodman99999
6,159 posts
 
I said, "personally".        You’re welcome to your opinion, if you have one regarding time-constants (which is to what I referred, but- you never addressed) and anyone else’s, that you value.
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bdp24 OP
9,821 posts
 
I’ve read concerns from a couple of amplifier designers about time constant ramifications resulting from the use of bypass caps. They state that contrary to the opinion of some audiophiles, bypass caps are to be avoided whenever possible. The obvious question is: "What designer(s)?" I don’t at the moment recall, but it was a couple of biggies, on the level of Nelson Pass, if not in fact he himself.
rodman99999
6,159 posts
 
I just prefer not to give myself a reason to think about possible timing/phase anomalies, anywhere in my music's path.      That's been my stance, since the early Eighties.       Like everything else; opinions vary.       
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bdp24 OP
9,821 posts
 
By the way, I too have bought parts from Michael Percy, the last time earlier this year. I hope he's doing okay, he's a great source.
rodman99999
6,159 posts
 
Absolutely and good to hear, he's still in the game!    I always enjoyed our conversations, appreciated his ear and wisdom.
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