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Duelund JAM paper in oil , Cu foil Capacitors as coupling caps on Tube Amp

On my tube amp from Cary Audio, I have been happily enjoying sound of  Jensen Paper in Oil , Copper foil, Alu Case capacitors ( value 0.22 / 630 VDC ) as coupling caps. I like its lush , liquid sound, not harsh. As they are 9 years in use now, I may need to replace them soon. I just found that Jensen has stopped production so was considering a good replacement to match the sound. I get option of  Duelund JAM paper in oil , Cu foil Capacitors which are at present available at good price ( $45 per pc. ). I like to know if anyone here has used these caps as coupling caps and how is the experience. What change in sound can I expect going from Jensen PIO caps to  Duelund JAM PIO caps?
Or does anyone have other recommendations for substitute of Jensen PIO caps? 
My amp has a small chassis, hence may be difficult to put large caps.
Your views, comments , suggestions are welcome.
Thanks

radni
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rauliruegas
13,084 posts
 
@erik_squires  I'm asking specific measurements coming from the manufacturers and if posible against Wima or the like caps.

In other thread in this forum some one posted how Duelund measured in its caps and resistors and guess what: measured terrible bad and that could explain the added colorations.

MUSIC is accuracy: do you know that?

R.
jond's avatar
jond
5,841 posts
 
If your caps are only 9 years old and not showing any leakage or audible effect its unlikely you need to replace them. Unless of course you just want to try something new.
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rauliruegas
13,084 posts
 
Dear @erik_squires  : "  Please show the study where it is shown everything that can be heard is already measured. "

your sentences makes no sense because you already knew that study does not exist.

Now, does not exist that kind of study does not means some timwe in the future some one could does it if he knows what and how to measures.


Btw, other example of caps that make " everything sounds the same ":

https://www.mouser.com/datasheet/2/212/KEM_F3118_R76_125C-1775941.pdf

R.
paulcreed
559 posts
 
Raul did you buy stock in those Wima caps, just kidding. I understand your philosophy that a quaility design may not or will not benifit from a boutique cap. Some gear the best and easiest way for it to sound better is boutique caps. In my experience I prefer the boutique caps. To the OP I like the Jupiter copper foil for the lush sound, Miflex are cheaper but huge. I don't think 9 years will make a cap go bad. I have a Scott lk48 from the 1960's that sill sound fantastic.

radni OP
96 posts
 
Thanks paulcreed  and jond, for your valuable suggestion regarding checking of life of my currently installed coupling caps. I intend to check for any leakage and measure the value on capacitance meter before going to change them.
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