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Old 20th September 2012, 09:21 PM   #7361
le´flu is offline le´flu  Germany
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Phewwww, seven-hundred and something pages to search through...
thats hard work.
But thanks for the advice concering the bypass-C.

Concering the tweeter-C ... at the moment i´m really favourizing the vishay
mkp1840 - they are cheap at pollin and great
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Old 20th September 2012, 09:23 PM   #7362
Joachim Gerhard is offline Joachim Gerhard  Germany
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Yes, the MKP1840 is a great cap. Vishay even revived the great Roederstein name.
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Old 21st September 2012, 09:00 AM   #7363
hesener is offline hesener  Germany
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Quote:
Originally Posted by Joachim Gerhard View Post
...
Study the spec sheet and look where the main cap has it´s minimum impedance and blend in the bypass where the main cap starts to be inductive.
...
excellent advice, applicable also to bypassing in power supplies
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Old 21st September 2012, 09:03 AM   #7364
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Joachim Gerhard View Post
You have to find out yourself. Sorry, no spoon feeding. You find it on this thread somewhere. It is not a secret, just a lot of listening and measurements. One Tip : the rule to bypass the main cap with a cap that is 1/10nth the value does not work. The bypass cap is much smaller.
Study the spec sheet and look where the main cap has it´s minimum impedance and blend in the bypass where the main cap starts to be inductive.
For speakers it it different because of the high currents that flow and the immense shaking. What matters most here is to suppress mechanical resonances.
A densely wound MKT can sound better then a teflon cap with loose windings.
Dielectric absorption is a minor problem in speakers because the cap can not build up much energy. The low impedance of the speaker short circuits the cap mostly all of the time.
I agree... After numerous experiments I found that bypassing a 4u7 MKP with a 15pF SM gives the best results in some of my preamp builds.
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Old 21st September 2012, 10:51 AM   #7365
Joachim Gerhard is offline Joachim Gerhard  Germany
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Ricardo, this is an extreme case but i trust your listening. I usually land in the 1 - 3.3nF range so it is more like 1/100 or a bit less. This could be also system dependent. That was the reason i said " no spoon feeding ". Had i given the makes and values people may have thought that they are the holy grail preventing them to do their own experimentation.
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Old 21st September 2012, 11:27 AM   #7366
RCruz is offline RCruz  Switzerland
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I have a lot of bypassing caps with aligators soldered in it´s legs so I can swap them fast.

I start with 1nF and go down until I reach the desired subjective trebble response !

It also depends on the type of MKP used.
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Old 21st September 2012, 11:36 AM   #7367
Joachim Gerhard is offline Joachim Gerhard  Germany
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Maybe i prefer a somewhat brighter sound. I have no problem with sibilance though.
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Old 21st September 2012, 02:46 PM   #7368
Joachim Gerhard is offline Joachim Gerhard  Germany
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pdul, your transistors have arrived, many thanks. I have prepared 50 of yours and do the rest today.
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Old 21st September 2012, 06:19 PM   #7369
pdul is offline pdul  Denmark
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Hope some of them will be good spouses for your 327s
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Old 21st September 2012, 06:19 PM   #7370
Joachim Gerhard is offline Joachim Gerhard  Germany
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I just setup the measurement. In 2 hours we know more.
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