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In Reply to: RE: different types of russian caps..... posted by vinnie2 on August 12, 2015 at 10:33:53
I usually don't post too much about capacitors, but in the case of the Russian surplus caps I make an exception. I have been using the Russian caps for 13 years now. In the spirit of DIY the Russian caps represent great value, and if used properly are as good if not better than boutique caps. I have a huge supply, so don't mind getting the word out. My observations are pretty close to yours, with the exception of the level playing field, concerning the Russian silver and micas and the FT-3 Teflons.Give the Russian SSG (CCR) Silver and mica caps equal opportunity (correct value), my favorite coupling caps, followed by the FT-3 Teflons. The KBG-MN (KGR-MH) are my favorite cap in the 1-10uf range, really good as output caps in preamps/linestages, parafeed caps, and in speaker crossovers. These are of true paper and oil construction, but aren't slow and syrupy like some PIOs. Some have aluminum foil and a few are copper foil, as Forest Gump says "like a box of candies". Another cap, that you don't show, is the MBGOs I use them in power supplies instead of electrolytics or motor runs, they also make great arrays for cathode bypass duties. I'm running 4 160V 30uf MBGOs in parallel in a 300B amp as cathode bypass caps, with very good results. These are of metalized paper and oily/waxy/granular kind of stuff. Not as nice sounding as the KBGs but are pretty darn good, the best I've found in larger values and voltage. Another cap, the K75-10s have technicolor mids, with a slight sacrifice in the extreme highs, great for voicing purposes.
Of course the down side is the size. I don't mind, as I build my stuff from scratch, and don't have the WAF to deal with, so can make them as large as I like. Lately I'm building a pretty heavy set of amps, that is a 2 stage integrated design, with the power supplies on a separate chassis. Both chassis are pretty large and heavy, only adds to the steam punk mad scientist look. 8-)) Have fun!
twystd
Edits: 08/13/15Follow Ups:
Mikey, Ely and you have over the years provided simple and helpful capacitor information for novice players like me.
The USSR surplus caps are still reasonably priced great sounding and reliable for DIY or vintage repair. Thanks for sharing its been very helpful.
.
Well my curiousity got the better of me and I built 2 stacks of 4 0.126 uf silver micas and put one on each channel. That is indeed some very good sound, and I think they do dust the paper and oils when they are of equal value.
Now if I can just find a forklift to carry them around...... : )
Edits: 08/13/15
The good thing is they aren't broken in yet and still sound great. Another good thing is the silver and micas break in pretty fast. 10-20 hours will get you most of the way there.
twystd
Hi,Interesting that you mention K74-10. VERY few of them are offered now a days!!!
The K73 ( -16, -17 ) are a similar dielectic. Have you compared the K74-10 to them much? What was your impression, listening wise ?
I have K73s, is why I ask, readily available in 2015. Thanks a lot.
Have you ever compared MBGO to MBGCH-1, the later designed for pulsed AC ??
Ever try DynaMat wrapping on the steel bodied, non-nuded Russkies ?? Thanks.
Jeff Medwin
Edits: 08/13/15
Sorry Jeff, too many numbers, too small of a brain. I made a mistake, that post should have read K75-10, not K74-10 I have no experience with the K73s, so can't help, but the K75-10s have the technicolor midrange.
twystd
LMAO, no problem. I also use K75-10s, in spots. Besides the midrange, I find they release energy quickly, VERY accurate on music's initial transient, and decays.
If they can ignite a H-Bomb, they can do a Bach Cantatas pretty well also.
I often "nude" mine, add a rubber washer around them so they don't touch the chassis, nor other adjoining caps. The lead outs in the ( early) photo got replaced with two Kimber Kable TCSS, which has a better top end, sounded better to me.
JM
You know I remember reading something in sound practices by JC Morrison a while back where he was saying he likes to use the smallest value coupling cap he can get a way with. I am beginning to understand what he meant. The smaller value ones seem to give better response time. Anyway, I like to play around with different values and different types to do the final voicing of anything I build.
I will have to try some of the mbgo's and see how they sound. Thanks for the tip.
Well you're certainly welcome to try the MBGOs, but in your application (coupling/output) the KBGs are IMO much better.
twystd
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