I installed V-caps two years ago but I don't remember whether they surpassed my previous Jensens CIO's or not. Jensens were sweeter and more airy, while the V-caps have better bass and a sonic signature reminiscent of Class A SS amplifiers.
I never heard the before and after on my Sli80, as I got mine with upgraded caps. However, I have upgraded caps in all tube amps, and the benefit has always been very noticeable and worthwhile.
However, you can do a lot better than a Jenson for the price.
Upscaleaudio about Jensen oil and copper capacitors:"Gives you the midrange we crave by giving you a more pleasing midband, while increasing clarity & texture". I'm in search for technical details: Which capacitors to replace and with which Jensen type.
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