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My first preamp with tubes
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Old 30th March 2014, 03:21 PM   #621
Max Martin is offline Max Martin  Sweden
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Can i keep my Cree diodes on the lower triode? Or I use only one? (0,85V drop)
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Old 30th March 2014, 03:46 PM   #622
Shoog is offline Shoog
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You could try it with one, would probably be OK. They can bias up a little unpredictably since you have removed the negative feedback element of a resistor. You can always trim it with a small resistor in series with the cree.

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Old 1st April 2014, 09:41 PM   #623
Max Martin is offline Max Martin  Sweden
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I'm not sure about some things, see pic

Is this a correct Mu-fallower? There is one extra cap too? Want to try it later this week and see how it goes.
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File Type: png mu follower.png (11.5 KB, 136 views)

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Old 1st April 2014, 10:09 PM   #624
DF96 is offline DF96  England
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That looks like a mu-follower.
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Old 2nd April 2014, 05:42 AM   #625
Max Martin is offline Max Martin  Sweden
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I found this pic on the web, think it's from tubecad. Is the 0,22uf cap and 1M res legit in my configuration with russian 6n3p tubes?

Shoog: You didn't mention anything about this values? That's why i thought maybe this is not a mu-follower. I read also on tubewizard and they also said that there was two different ways to take out the signal. I guess i got little confused.
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Old 2nd April 2014, 07:15 AM   #626
Shoog is offline Shoog
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Looks good to me.
You can try taking it off the cathode of the top tube, and then try taking it off the anode of the bottom and see which you like best.

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Old 2nd April 2014, 08:31 AM   #627
fdegrove is offline fdegrove  Europe
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Hi,

Quote:
Shoog: You didn't mention anything about this values?
I'll do the math for you later on today if you like.
B+ 300VDC at top anode, correct?

Ciao,
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Old 2nd April 2014, 11:25 AM   #628
Max Martin is offline Max Martin  Sweden
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Quote:
Originally Posted by Shoog View Post
Looks good to me.
You can try taking it off the cathode of the top tube, and then try taking it off the anode of the bottom and see which you like best.

Shoog
Ok, thx
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Old 2nd April 2014, 11:27 AM   #629
Max Martin is offline Max Martin  Sweden
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Quote:
Originally Posted by fdegrove View Post
Hi,



I'll do the math for you later on today if you like.
B+ 300VDC at top anode, correct?

Ciao,
I have about 280V now but release drop i think i can easy get 300+. I just thinking shoog said "little more" that made me just think 300

That would be super
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Old 4th April 2014, 09:55 PM   #630
Max Martin is offline Max Martin  Sweden
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Today i converted my SRPP to Mu-follower.

My music-pc decided to take a dive into "black" screen land so i didn't get more than 2-3 h of sweet music but one thing is for sure. I have a certain calm approach from top to bottom i haven't heard in my system before meanwhile voices are upfront. With SRPP it was a little nervous, light aggressive sound and everything was upfront. Now it's more front-to-back perspective. Quite nice to hear a piano sound effortless further away while the singer is in my lap

I had to turn my bassamp some 0,3-0,5db down to get a better overall sound cos mu-follower gave me more bass (but same quality as before if not little bit better)

Thx alot to Frank for providing me with a schematic and help along the way.

When I'm writing this i really feel addictive to mu-follower, maybe that says enough
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Last edited by Max Martin; 4th April 2014 at 09:59 PM.
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