 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
85.164.178.199
I've spend some time with the small 0.22uF 200V k40y-9 russian paper in oil capacitors in the output of my gyrator loaded 26 preamp and to my ears they are excellent. In fact I think they are better than my old Jensen copper foils. Anyways, has anybody done a sound comparison of the k40y-9's with different voltage ratings? Is there something to be gained soundwise from going for the 1000V version (besides getting more oil)?
Follow Ups:
I use K40Y-9 in vintage Fisher rebuilds. I use 200 volt at phone section and 400 volt everywhere else except the power tube grids at 600 volt. My Fisher rebuilds are known for the best sounding and stomp the common Sprague Orange Drop rebuilds. I never fond anyone else besides Michael Samara that uses the K40Y-9 in Fisher rebuilds.
I have found that the 1kv rated K40Y-9 caps sound a little better than the 400v ones,provided you have a higher B+ across the cap.When I cut open a .1uf at 1000v k40Y cap,I could see oil oozing out of it. When I opened a .1uf at 400v K40Y,I didn't see oil coming out.This doesn't mean there isn't oil in in the lower voltage caps,it just means they probably use more oil in the larger caps.
I would leave your preamp alone if it sounds good but you could try the .22uf at 400v K40Y cap or maybe try a pair FT2 .1uf Russian teflons in parallel.Measure the DC voltage across the cap you have in there now. If it a 100vdc or less,leave it be.If it's 180vdc,put in a 400v cap. Now if you try the FT2 teflons,those are rated at 200v but they don't show any leakage at all until they get 780vdc across them and even then,it is very little.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Thank you for responding. Yes it sounds good, but it is a little dry and lacking in bass extention. The thing I really like about it is that it is focused and relativly fast for a paper oil. It must be well damped. With more bass it would have been very good.
I love K40Y caps to death as it is my favorite cap along with the Vitamin Q.
I much prefer them in the interim stages of an amp and preamp,along with driver to output stages of amp.
The reason I say try the Russian teflons is,they a very similar sonic flavor in a lot areas of the K40Y but it would no doubt better if you use the teflons in the output of a preamp.They are cheap to try and I have s feeling you will like these caps.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Great caps! I use 1KV rated, exclusively in amps. The 400VDC rated one go into guitars, only because I have some fit issues with guitars.
K40Y-9 caps, Vintage Jupiter, and Dynami-caps have become my standard go-to, in most vintage amp restorations.
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
