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Orgy of Capacitors: The Cap Thread - Page 38

post #556 of 559

I sanded the leads so they must be some issue with their innards as well. I will tear one apart and photograph it :)

 

I also received some K71-7 yesterday with 0.5% tolerances. They measure superbly on my CLR. It will take some time before I test them though. My Salas folded phono still needs lots of work...

post #557 of 559
Quote:
Originally Posted by dimkasta View Post
 

By the way, I received a batch of 20 3nF FT-1s to check on my phono, but some of them were duds. That was the first time I came something like that in russian caps. About half of them were measuring ~1,4nF and the dissipation factor was all over the place. I managed to get 2 matched pairs with almost 0 D, but I had to discard around 10 of them as absolutely not usable.

 

As a first indication, the leads were almost black and had to be sanded. I guess they were stored in very bad conditions since it is the first time I see something like this, and I have bought a lot of Russians in the past.

I have had a similare experience with FT-1s.  From three batches, it seems like 1 or 2 in 10 arrive bad.  I contacted the seller, told him so many were out of spec, and he refunded that portion of my order.  I haven't had this trouble with any other Russian caps, including other teflon caps, but I understand that the FT-1 uses a very thin teflon film and that with age, holes in the film can develop and degrade the caps.

 

I never expected perfect results from NOS parts.  The recommendation is to buy a few extra if you buying FT-1s.

post #558 of 559
Perfectly sensible suggestion
post #559 of 559
Hi Jon
I have really found your musings on capacitors worthwhile in my mods. I am thinking of using .68 K75-10 capacitor and considering bypassing it with the V cap TFTF as you suggested in your post earlier in the thread. However reading your assessment of the Vcap CUTF I would like to consider it as the bypass for the K75-10.. Have you or any members of this forum tried this capacitor combination?. Your thoughts would be appreciated.
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