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dynaco A25 super bright

The original cap is 5uf and, within a 10% tolerance, 5.1uf and will NOT make a difference. 5.1 is closer to the original than the 4.7 anyway. Mine have been in there for 2+ years with no problems. If your ears can hear a .4uf swing in a cap, then you are a better man than us in here. But, go with what works for you.

Bypass caps add in their own oddities and are personal preference. Most times they were used in conjunction with cheaper electrolytics to add in some sonic characteristics of the poly cap. Used with good quality poly caps, though, is a waste. I've always removed them and not used them again with better caps. Just my $.02 and YMMV.

Appreciate your thoughts on my comment but I actually CAN hear a difference as I'm sure many people could if they have experience rolling their own speakers and have actually tried different cap combinations to obtain the sound they were looking for. The fact that yours have been in your speakers for more than 2 years and have caused you no problems means absolutely nothing. I can put a 6uf cap in there for that matter and it will cause no problems... Is it right? No.
You refer to me being a better man than "us" if I can hear the difference.... I'm so happy you can speak for everyone else here and "their" ability to hear things.

Have you ever tried the difference yourself? I'm sure you would hear the difference between 5.1 and 4.7 ... Which by the way happens to be the original value in two different pairs of A-25's that I've opened up. None of them were previously modified either. Maybe yours were
5uf, I'm not doubting that. The fact that it is a simple first order crossover with one cap on the tweeter will allow you to hear the changes in sound when one increases the value of the capacitor. (And yes, by as little as .4uf) 10% tolerance is "accepted" simply because it is too costly or counter productive for speaker manufacturers to keep it under that. This is one of the reasons you pay more for speakers that have matched components with tolerances of no more than 1%. Many of the uber expensive speakers match their components this way. Why would they do that?

If you bother to listen critically enough, you can and will hear the difference. Just don't rely on common assumption that a 10% tolerance means nothing. In a lowpass crossover network... Maybe. but in the most important part of the crossover where the woofer crosses to the tweeter... It makes a difference. Whether you care or not is a different story.

It's easy enough for the OP to try it if he hasn't given up already.
 
ok, I had a friend audition my A25s on his setup and he said they were anything BUT bright. He said that the highs actually sounded rolled off a bit. I did a little digging, and it turned out the power supply caps on my preamp were bad. I replaced the can on the Dynaco PAS and now things are sweet. I haven't had a good chance to really let things settle, but already things sound so much better.

Thanks to everyone for the advice.
 
I can't imagine anyone describing A25s as "super bright" unless something was wrong. The bass they make won't move the Earth, but it's so much more than your eye expects from a box that size they tend to kinda drop your jaw a bit upon first listen.

I agree. A25's anything but bass shy. Those woofers are incredible. Expect something is amiss.
 
Had similar problem with recap of klh 17. I almost cried when I first hear them- no bass at all. After playing them for an hour they seem to produce great imaging with better bass. Although the bass is not as wonderful as pre recap. I had always notice that it took about 30 minutes of play before my system to get the nice warm and deep sound with my Pioneer SA-9800. Could this be my amp? (Recently ask this question on KLH thread with no response)
 
Rather unusual for a SS amp but not unusual for a tube amp to need some time to thermally stabilize. As much as an hour. You may have some caps in the Pioneer that are getting on in age and need attention, taking time to stabilize.
 
O.P.
Looking at your pics, your room looks like it's somewhat "lively". (too many reflective surfaces). Try them in another room with some furniture, carpeting and drapes for example, and see if you hear a difference. Also, if you are using those stools as stands, they are too high. Rule of thumb, tweeter at ear height while sitting in your "listening chair". Dave
 
What it is:

Again:

http://audiokarma.org/forums/showthread.php?t=162000

I don't get why y'all are battlin' over 0.1 uF; it doesn't matter one whit, seen in context of the actual performance.... :dunno:

More:

http://audiokarma.org/forums/showthread.php?p=2422736#post2422736

Dynacos have more bass than KLH-17s, apparently, but....

To some owners, KLH-17s have wonderful, deep bass. :dunno:

Measure for the answers; even a R/S SPL meter is good enough to resolve this matter.... :yes:

http://audiokarma.org/forums/showthread.php?p=2290649#post2290649

"How" begins here:

http://audiokarma.org/forums/showthread.php?p=2279377#post2279377
 
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