Capacitor


Dear friends I am interested to upgrade my caps in the tube preamp from Audio theta tin foil 3uf200VDC to Miflex1uf 240VDC copper foil what are your thoughts will reducing the value to 1uf affect the bass and frequency response or should I go with a higher value than 3uf  
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For the very small caps (0.01uF), there is very little difference in price between Dueland Cast & VCap CuTF and the ones from your list. 

You should consider the Dueland or CuTF for the 0.01uF because for very little more money, you can get a lot more performance.
I am placing the order for the Jupiter 3.3uf the Jantzen superior Z could make me smile I can not say what the Jupiter will do.
Vcap Odams are the better choice, vs Jupiter, as I use both in speaker and electronics applications.  Not close.  This is something I can say with 110% confidence. You will like the Jupiter, no doubt, but miss out on what the Odams do better. 
@grannyring , you've really piqued my interest in trying the Odams in my highly modded Klipschorn crossovers. Presently using combo of Jupiter VT and Audyn True Copper Max. So, how will odam improve on these caps? And how are they on tonal balance, accentuate, soften or change any part of frequency spectrum? My total system is voiced for these caps, wouldn't want any frequency spectrum changes.
I'm also amazed by the relatively small size of the odam, and relatively low price. I've only considered Duelund Cast as upgrade up to now.