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
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.

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.
I knew that that will be the OP answer/OP because as many of us is a very well trained gentlemans that " eated " what the AHEE teacher gaves all of us.

Maybe for some of you could " sing " as a bad joke but that extremely humble FKP-1 Wima cap outperformed a 100.00 V-cap teflon CU for only 2.00. Unveliable for say the least but things can happens when we try and lear. Not for very one and more important not for bad/medium electronics quality designs..

R.