My first preamp with tubes - Page 63 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 30th March 2014, 02:21 PM   #621
diyAudio Member
 
Max Martin's Avatar
 
Join Date: Apr 2011
Location: Sweden And Finland
Can i keep my Cree diodes on the lower triode? Or I use only one? (0,85V drop)
  Reply With Quote
Old 30th March 2014, 02:46 PM   #622
diyAudio Member
 
Shoog's Avatar
 
Join Date: Aug 2002
Location: Eire
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.

Shoog
  Reply With Quote
Old 1st April 2014, 08:41 PM   #623
diyAudio Member
 
Max Martin's Avatar
 
Join Date: Apr 2011
Location: Sweden And Finland
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.
Attached Images
File Type: png mu follower.png (11.5 KB, 105 views)

Last edited by Max Martin; 1st April 2014 at 08:43 PM.
  Reply With Quote
Old 1st April 2014, 09:09 PM   #624
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
That looks like a mu-follower.
  Reply With Quote
Old 2nd April 2014, 04:42 AM   #625
diyAudio Member
 
Max Martin's Avatar
 
Join Date: Apr 2011
Location: Sweden And Finland
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.
__________________
Life is hard then you'll die. Thank god for tubes =)
  Reply With Quote
Old 2nd April 2014, 06:15 AM   #626
diyAudio Member
 
Shoog's Avatar
 
Join Date: Aug 2002
Location: Eire
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
  Reply With Quote
Old 2nd April 2014, 07:31 AM   #627
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
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,
__________________
Frank
  Reply With Quote
Old 2nd April 2014, 10:25 AM   #628
diyAudio Member
 
Max Martin's Avatar
 
Join Date: Apr 2011
Location: Sweden And Finland
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
__________________
Life is hard then you'll die. Thank god for tubes =)
  Reply With Quote
Old 2nd April 2014, 10:27 AM   #629
diyAudio Member
 
Max Martin's Avatar
 
Join Date: Apr 2011
Location: Sweden And Finland
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
__________________
Life is hard then you'll die. Thank god for tubes =)
  Reply With Quote
Old 4th April 2014, 08:55 PM   #630
diyAudio Member
 
Max Martin's Avatar
 
Join Date: Apr 2011
Location: Sweden And Finland
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
__________________
Life is hard then you'll die. Thank god for tubes =)

Last edited by Max Martin; 4th April 2014 at 08:59 PM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Vintage Preamp Tubes iriegnome Swap Meet 0 25th January 2010 03:26 PM
Tubes as preamp.. Ryssen Car Audio 9 25th July 2006 05:34 PM
preamp tubes change mongiak Tubes / Valves 3 19th August 2005 05:44 PM
What tubes are best for preamp? ronjg Tubes / Valves 7 31st May 2002 11:36 AM
Just finished my first tubes-preamp Ralph Tubes / Valves 7 26th April 2002 09:26 AM


New To Site? Need Help?

All times are GMT. The time now is 03:56 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2