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Old 5th April 2012, 09:38 PM   #911
ra7 is offline ra7  United States
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Thanks for that summary generg.

Can you also summarize how that mu follower circuit works?
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Old 5th April 2012, 09:39 PM   #912
Zen Mod is offline Zen Mod  Serbia
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my fave Philips or ERO or ROE 10nF MKC as bypass ?
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Old 5th April 2012, 09:43 PM   #913
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I have used claritycaps SA, nice! neutral with little warmish
I open a bit bypassed with small mundorf s/o , you can use a supreme or Vishay MKP1837
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Old 5th April 2012, 10:07 PM   #914
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Originally Posted by generg View Post
Have nice Easter Holidays Mike!
Same to you!

And, thanks for the capacitor info. I've been very tempted to try some fancy caps myself.
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Old 5th April 2012, 10:36 PM   #915
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Michael here nice guide Humble Homemade Hifi

and http://www.audiocircle.com/index.php?topic=54218.0
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Old 6th April 2012, 05:52 AM   #916
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Generg my no cap input is my fav with source resistor version .... but..... in absolute case i use Epcos MKTS ( very expensive on radiospare) or audiophilus Clarity cap ESA 250V ..
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Old 6th April 2012, 07:14 AM   #917
generg is offline generg  Germany
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Yes the most horrible moment is when you recognize that they sound all so different...!
The better moment is when you recognize that they all do some things good and some more bad and that you have the choice that is no choice......

And you tend to look at the components before and after that cap to be neutral, when you begin to realize how many of these components also have to consider you could get crazy by the permutations you have to test....and you begin to relax...
But back to the point really .........astonishing sound change by one cap.

Of course I will try to use "no" cap, the output cap of my UGS is Nelson like an 220uF bypassed by a 100nF MKC (hi ZM ), doing the job alone, I must only put away the 100k after the outputcap because it changes the bias voltage! To lower voltages, means higher current, means hotter SK82.
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Last edited by generg; 6th April 2012 at 07:29 AM.
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Old 6th April 2012, 07:27 AM   #918
generg is offline generg  Germany
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Quote:
Originally Posted by ra7 View Post
Thanks for that summary generg.

Can you also summarize how that mu follower circuit works?
It behaves more complicated than the simple solution B Mike suggested (CCS with Semisouth)
To give an example, I trimmed the k2 dominant to K3 and the hissing sounds got too sharp. I thought that the sound should get more darker....
So I am still looking for the right mix.....
And when I want to relax after the desperate search I take the simple MIKE CCS because it sounds simply good.

So I cannot say up to now that the MU is better or much better than plain CCS...
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Old 7th April 2012, 12:58 AM   #919
Anchan is offline Anchan  United States
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Default Gain Question

Hello-
You guys are doing a great job with this thread. I really don't need another amplifier, but I am really tempted anyway. Perhaps someone can relate.

A few questions:
1) What is the gain of the Hammond Choke version? I thought I saw 6db somewhere, but cannot seem to find it again. The CCS version I believe is 8db.

2) If I wanted to add a simple preamp to this amp, how much voltage swing is OK on the gate of the 2SK82. 5-7 volts OK? I'd like to get a good 10-15V peak output to the speakers if possible. Is that possible with just a 24V supply as in the Hammond Choke version?

3) If I go with the CCS version of this amp, what are the thermal resistance heat sink requirements on the CCS transistor, as well as the 2SK transistor. It looks like Micheal was using a .3 C/W unit from Newark for the CCS, but what about on the 2SK? I'd like to trim down the size if possible. Would a .5C/W on each device be too small?

4) I know its heresy, but I was considering going switch mode on the PSU. Maybe something from here: http://connexelectronic.com? Maybe this: http://connexelectronic.com/product_...hkg7ut5plrird5

Thanks again.

Last edited by Anchan; 7th April 2012 at 01:03 AM.
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Old 7th April 2012, 08:19 AM   #920
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Quote:
Originally Posted by generg View Post
It behaves more complicated than the simple solution B Mike suggested (CCS with Semisouth)
To give an example, I trimmed the k2 dominant to K3 and the hissing sounds got too sharp. I thought that the sound should get more darker....
So I am still looking for the right mix.....
I'm nearly ready to build. Do you have second thoughts about your Mu follow design? If you have K3 dominate K2 does it sound good?
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