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AirTight ATM-300 - new Coupling Caps

So I want to replace the coupling caps in my Airtight 300B amp. The original ones are $5 Sprague orange drops. 0,1uF interstage caps between input tube (12AU7) and driver tube (12BH7A) and 0,47uF between driver tube and 300B.

I love the amplifier, it is very resolving and airy with great soundstage separation. However I miss some body and fullness, and tighter bass, hope new coupling caps can help with this. I like a natural sound with lots of body and texture, good detail and a tight and deep low end.

I have read alot of forum posts and narrowed my choices down to these 3;

Duelund CAST cu sn tinned copper

Jupiter copper foil paper and wax

V-cap ODAM

I have read that some capacitors are best used in lower voltage applications and others are better in higher voltage applications, so I am open to using different brands in interstage/300B coupling. 

Please share your experiences, impressions and recommendations. Not necessarily with the Airtight, but preferably used as a coupling cap.

rubjel
rauliruegas
13,353 posts
 

Dear @rubjel  : The boutique caps as the ones mentioned by you all are totally colored not neutral and pay money for that added colorations/distortions.

I tested all those and several more and found out the same: colored, including Mundorf.

 

Best caps are the ones Standard of the Industry ( not only audio but in medical instruments, aerospace, military industry and the like ) and are unbeatable in its kind of work: Wima FKP1. Period.

 

Regards and enjoy the MUSIC NOT DISTORTIONS,

R.

rubjel OP
16 posts
 

Dear Raul, I respect your opinion but I have made up my mind about replacing the coupling caps with one of the 3 mentioned. I should have stated clearly in my opening post that I am not interested in arguing over whether boutique caps are worth the money or not. 

erik_squires
17,543 posts
 

Just want to be 100% sure, these are signal caps and not in the power supply/filter caps?  I ask cause the orange drops were often used for power supply filtering use and needed to be rated for such. 

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