AirTight ATM-300 - new Coupling Caps

@rubjel used them in two locations. Interstage coupling and as PS filters on the input PS caps. 

All were excellent caps. The Dueland and Jupiter are both very organic sounding with huge instrument depth and placement. The V-caps were also quite good. Maybe a tad less of the organic sound of the other two. 

Just to make sure we were not imagining sonic differences we switched back to a typical but good plastic film cap. Holy cow, was a huge downgrade in sonics. 

There were four of us in this cap experiment. Wanted to make sure we got input from everyone. Did not try these caps on any SET amps all were P-P. The amps we ran the trials on were VAC, VTL and ARC amps. The first two were fully differential.  

If you are using the stock plastic film caps now, you will get a huge smile with a switch to any of these better caps. 

This is gold @johnss, exactly the kind of info I'm looking for!

So better quality input PS caps will also provide better SQ, this will get expensive :)

Your comment about Jupiter and Duelund being more organic than V-Cap is very valuable, as this trait sits high on my priority list! 

Just to be sure, the Duelund CAST was the tinned copper or the regular copper?

Very encouraging words, I can't wait to install new caps :)

MultiCap has now become Reliable Capacitors now owned by Wilson Audio (https://www.reliablecapacitors.com)

MultiCap is a special design of capacitor - each individual capacitor being a bundle of smaller capacitors. Wilson Audio obviously is a big user.

Sound improvement was denser while at the same time also being more detailed.

Dear @salectric  : And what about the ones in crossover of speakers?

I don't know what is your point but a cap must be totally neutral. Please read the link I posted where explain everything about caps.

Signal coupling caps or crossover has no meaning the cap it will makes its same job.

At the input of my monoblocks amps that along coupling function as high pass filter I changed the Cu Teflon V-caps for FKP1 and just hands down the V-caps.

All is about knowledge levels.

R.

@rubjel The Copper V-Cap (CuTF model) is an excellent coupling cap in tube electronics, and this applies to any coupling application—-input, interstage and output.  I haven’t used it in a bypass position or in a power supply application so I limit my recommendation to coupling applications.  I also have never used a V-Cap with solid state gear.

CuTF caps have strong bass with excellent dynamics and excellent detail.  The only other caps I would consider as signal couplers in tube electronics are Audio Note copper foil and silver foil and possibly Jupiter copper foil.  I say “possibly” because I haven’t used Jupiters in my own equipment although I have heard them in other preamps and DACs.

@rauliruegas Crossover caps are a very different application.  I understand you preferred FKP over CuTF in your amps, and that’s fine.  Everyone has their own tastes.  No capacitors is perfect.