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In Reply to: RE: Russian K40y9 input coupling caps - first impressiond posted by KanedaK on February 11, 2017 at 04:23:35
It has been postulated by Tom E, unless I am misinterpreting, that the K40 caps are filtering "unwanted" bass frequencies. KanedaK, do you hear a rolled off bass from the K40's compared to the Arcotronics. This comment, on the surface, seems bizarre to me. That just changing the cap would get rid of "unwanted" low frequencies. What is an unwanted low frequency? Once again I may be missing something. If I am maybe you can ask Tom E for an explanation. All I saw in your post is the one cap change. So even if the cap got rid of "unwanted" low frequencies it would still be because of the cap. Not unlikely that a better cap would improve the bass. T456
"The Borg is the ultimate user. They're unlike any threat your Federation has ever faced."
- Q, 2365
Edits: 02/11/17Follow Ups:
It wasn't a postulation. If you took care to read the OP, you'd know that. In addition, the photo clearly showed a .033uF cap. What low frequencies do you think a cap of that value could pass?
berate is 8 and benign is 9
Tweaked, in this case i voluntarily changed the value of the input caps to create a 96Hz high-pass filter. This little 8 watts amplifier drives the midrange and treble horns in my system. See my other post about it ;)
The decision to use Russian PIO caps came second, browsing the bay for caps with the right value, and reading so much good things about these. I must say I'm impressed so far!
But yes, I will have to let things settle down.
The sound is still changing, I can actually hear it change: I already réajusted the relative volume of this amp with the volume of the bass amp, twice. Ever so slightly, but I had to adjust it twice: first lower it, then put it slightly higher again, then lower it again.
The burn-in of these caps seems to be quite rocky and roller-coasterish but the nice qualities remain throughout. I'm sure it will turn out fine (I remember, when I fully recapped my preamp with SilmicII caps, the sound became so dull after a few hours that I was almost sure I broke something, and it took another 100 hours to open up completely again... hard days ^^)
By the way, I had previously swapped the Nippon Chemicon reservoir caps with bigger (2200uF) Nichicon FG caps and it was a step back. I left them is for months but somehow the sound was sluggish and flat. I put the old caps back in and miracle, good sound was back!
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