Audio Research LS-15 Infincaps

He wrote "...Ei 6dj8". Ei is the abbreviation that a European company named something like Electrical Industries uses. They're available all over, are quite inexpensive, and certainly are among the best-value NP tubes around. Here's one source http://store.tubedepot.com/ei-6dj8eg.html among many. I've happy with my results with Ei 12AX7s, 12AU7s, and Tube Depot.

On your original question, here's an informed opinion about capacitors--
http://www.altavistaaudio.com/caps.html
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Thanks. This is what I am talking about!!! Great suggestions. As I said before, I really like my LS-15 and just looking to improve the way it sounds. Selling it and getting something better is certainly an option in the future, when I really get sick of the pre-amp, but for now, I had it since 1999, bought it new, and still not tired of it. As for the tubes, I saw tubedepot on the web before, just dodn't know how reliable those guys are. Is it safe to buy tubes from them? I may check out these EI tubes. Thanks all.

"I saw tubedepot on the web before, just dodn't know how reliable those guys are. Is it safe to buy tubes from them?"

Christian at Tube Depot has treated me very well over many transactions. He has accepted returns when I ordered the wrong things and has bias-matched my old Ei KT90s to the new ones I bought from him for free. He's a good guy.

Based on the pic of the LS15 here http://www.arcdb.ws/LS15/ARC_LS15_top.jpg , I'd say anyone who knows how to solder could replace those coupling caps with same-value better caps. Personally, I'd use the TRT D-Caps or Mundorf M-Cap Sup. S/Os, but you might also consider the V-Cap teflons, altho they're VERY expensive. But since you'd be saving the labor charge, maybe you could choose to afford them? Can you solder or have a friend who does?
.

Interesting thread. As an owner, I'd be interested in the different tubes as well. A few years back, I retubed with Sovteks from a dealer of ARC in Canada. When I got home, I realized that the factory set has a designation for each tube, V1, V2 and so on. The ones the dealer sold me had no such markings, and to this day I wonder if the damned thing is working right!
Can anyone explain the markings, and tell me if the tube sellers do the same so that each one is optimised for a certain tube socket.
Carl

Hi !
We are talking about the Infini caps in the signal path?
Anyone know when ARC changed from Rel to Infinite caps in the ls 15 .

Doesnt, ls 16 also have infini caps instead of Rel caps in the power section. Should these be changed in the ls 15 as an upgrade ?