Jupiter Caps in tube preamp application

Dear @jimbones  : Good that that is what you are looking for to achieve your targets and this is what it matters.

R.

OK so I did the swap and it want all that dramatic. Sounds clear as a bell I wouldnt classify it as a tone control. I dont hear any shift in tonality or any emphasis is any one area except maybe a bit stronger in the low bass region. This may be due to a difference in cap value (approved by the designer). I guess there is a break in period hopefully not as long as teflon lol

If you did it right you should hear deeper into the recording, more detail but in a smoother more natural way that may not be all that obvious at first, and this realistic smooth coherent sound will only become more natural and organic as the hours add up. That's a real good cap swap when you get that.

There are only two times anyone should be talking about tone controls with caps: in crossovers where the value does directly affect response, and when the listener isn't able to appreciate that the areas described above got better, instead noticing only the lack of grain and glare, which they misattribute to being toned down. Since you went the extra mile to check with the designer then you are quite correct to dismiss the poor listener and his misinformed tone control comment. If yer gonna mod, do it right- which includes knowing what to question and what to stand up for. Which you did. Well done.

@millercarbon, thank you for the thoughtful and respectful response. I did notice it was a bit smoother, Not to be confused with loss of detail. I will need to get more listening time in but there may be more detail. I did go from a 0.01uf to 0.022uf so there may be some effect from the value change as well. I'll keep you posted as to break in improvements. Thanks.

Jim,
I noticed an increase in bass as well with the Jupiter caps when I put them in my amp. I would give them a couple hundred hours to settle in although they do sound pretty good when first installed.

Scott