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69.40.59.129
I know this is very subjective, that is why I said preference. Quite a few years ago I bought a bunch of different types of Russian caps; k40-y9, K42-y2, ccr, k6f, m6f, k72 and t-3 (the letter names are what they look like to me).
I got quite a few different values for most of them except the t-3, that one is only 0.1uf at 1000v.
One of the last things I do with any piece of gear I build is have a cap rolling session for any coupling caps in the unit.
I am in the process of doing that now with the bread boarded low voltage 845.
I have tried them all at least once, and so far my favorite is a 0.1uf k40-y9, although I have to admit the k72 is pretty darn good too. I was surprised that I did not like the T-3 more than I did given all the praise it seems to have found on the net, but it sounded kind of dry to me.
I have used multiples in parallel with some of them to try larger values, but I am also finding that I prefer the lower values for a cleaner sound. With the k40 I started at 0.22uf and worked down to 0.01 then back up to 0.1 where it sounded best. It was pretty easy to hear the spot where it seemed to have the best all around sound by playing 3 or 4 different types of music at each point and listening carefully. It takes a little time, but definitely worth the trouble.
Basically I am wondering who else may have done this and what your preferences are?
Edits: 10/15/14 10/15/14Follow Ups:
I find the SSG's good for the money but..... The v-cap teflon in standard and copper has beat anything I have from Russia in sound. not and never in value but once I've replaced a coupler with one of their caps, the Russian never returns.
Now, for parafeed caps, the KBG is my go to over anything currently on the market :)
Next, you need to design with a direct couple between stages, under four inches, 16 AWG Siltec ( silver with a little gold ) , or three runs of 19 AWG Cardas silver wire, .... and ... series coupling caps will be gone forever in your amps. I can help you with the design, no problem.
Jeff Medwin
too much metal in them.no juice dry sounding.
Amnesiac,
Add a .033 uF DynamiCap ( ONLY ) as a bypass, and suddenly, you will gain ALL the moisture you wanna sense on the Soprano's lips.
That is a critical area to reproduce, and I just told you how, no substitutions allowed.
Jeff Medwin
Argghhhhhhhh! as good old charlie brown would say. This is not going to be easy. I just spent several hours going back through all my trials with different music after the amp had been playing for about an hour and was all nice and warm. Have to admit the SSG-3 sounded pretty good, but the T-3 really caught my attention this time around. If it is going to smooth out after a couple hundred hours this could be one heck of a coupling cap for my tastes. I really like the cleanness and the detail it brings. If it has any faults it is that it has just a smidgen of edge at this point, but it still has 199 hours to go for break if if what Mossback says is true. So that edge could go away. I guess I will let it stay in the circuit a while and see what happens.
Before I found the SSG-3's I ordered some SSG-2's off ebay. I don't know if there is a difference in sound, but I guess I will find out when they get here.
I was thinking about setting up a selector switch for each channel that would let me change them on the fly. Can I do that without causing major trouble in the works when I switch them?
Edits: 10/15/14 10/15/14
This is going to make me crazy. I have narrowed it down to the k40-y9 or the ssg cap, but I swear one sounds better on one song and the other sounds better on another.
I think I am going to have to give the listening a break for awhile and start trying to optimize the 6sn7 drive tube instead.
If anyone knows of any articles on line that tell how to do that with tube cad I sure would appreciate a link.
ONE HOUR ????
Caps need 100 to 500 hours to break in, playing in the circuit !!!
Jeff Medwin
Perhaps to hear all the little subtle differences yes, but I can hear differences when they are first put in the circuit. Since none of the caps have been broken in I think it probably gives me a fair idea if I am going to like one better than another.
Which is paper/mylar saturated in oil, which I far prefer to the K40Y. Use the K75 as the main cap, then bypass it with something like FT-3 in smaller value.
I just tried the K-72 this afternoon and I really liked it. Is the K-75 similar? I have not tried a smaller bypass cap though. What is that supposed to do?
Edits: 10/16/14
Caps, despite how they static measure on a bench, PLAY music typically in narrow band, so a smaller cap will play at a higher frequency.
There you have it.
Jeff Medwin
K40Y-9. Never disappointed in any circuit.
I've been using Russian caps for many years now, big fan of them. IMO their only drawback is their large size. For coupling I use the SSGs (silver/mica), if you need a higher voltage rating the KSGs (another silver/mica type) are great as well. A lot of folks like the Russian Teflons, but as Cleantimestream says, they take a long break in.
I use the MBGOs in power supplies, and cathode bypass (try to eliminate when I can), where I need lots of C. I like the KBGs for output on line stages, parafeed caps, and speaker crossovers.
twystd
As a person who never was a fan of the usual audiophile oil caps for coupling applications, I nevertheless tried some K40s in a preamp (2uF value, used for output); I was not enchanted, but that's me. I HAVE found the Russian silver mica caps, SSG, available in values up to 0.13 uF, to be quite superb as couplers, and they don't appear to require long break-in. Maybe they are a tiny bit bright at first but then very transparent within several hours.
I will have to give them another try and leave them in a while I guess.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
Dang, wouldn't you know that the smallest value i have is 0.5uf of that one. Maybe I will have to order some smaller values and try them out too. Do they break in fairly quick?
The largest value I have ever seen on eBay is 0.13uF, and those are huge already. Are you sure you have 0.5uF SSGs or could it be 0.05uF (stated as ~50,000pF on the case)? 0.5uF = 500,000pF.
I forgot to add that I also used them (lower pF values) in the RIAA network of a Quicksilver vintage preamp, to very good effect.
The 0.5 is a ksg. My opps.
I've also have never seen them that large a value.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
See above reply to Lew. I did find a couple of 0.127uf ssg-3 that I didn't know I had. They sound pretty good. Any difference between the ssg-2 & ssg-3 sonics?
Edits: 10/15/14
.
Have Fun and Enjoy the Music
"Still Working the Problem"
!
The Mind has No Firewall~ U.S. Army War College.
What do you consider extremely long? 100 hours? More?
The FT3 caps take at least 200 hours to smooth out.
Ouch! Oh well that figures because now I am leaning that way.
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