#26 pre amp - Page 313 - 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 3rd April 2013, 05:03 PM   #3121
diyAudio Member
 
Join Date: May 2009
Default VR SHUNT REG

In my experience so far, I really like CCS + tube shunt (0C3 being the best),
I am using a headphone amp right now whit this arrangement and its dead quiet. I am always using very low capacitors to bypass the tube shunts...so on the order of 0.01-0,05uF. For 26 I will use only passive elements...a CLCLC configuration but the chokes needs to have around 30-50H. The psu output impedance is not so important for 26 tube...
  Reply With Quote
Old 3rd April 2013, 05:10 PM   #3122
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Quote:
Originally Posted by DIYspaceW View Post
The psu output impedance is not so important for 26 tube...
+1
  Reply With Quote
Old 3rd April 2013, 05:15 PM   #3123
diyAudio Member
 
Join Date: Aug 2005
Quote:
Originally Posted by merlin el mago View Post
PSU very near 26 still no noise
Very NICE!
  Reply With Quote
Old 3rd April 2013, 05:18 PM   #3124
diyAudio Member
 
Vinylsavor's Avatar
 
Join Date: Feb 2002
Location: Lindau
Hi!

Congrats for the beautiful build Felipe!

Quote:
Originally Posted by DIYspaceW View Post
For 26 I will use only passive elements...a CLCLC configuration but the chokes needs to have around 30-50H. The psu output impedance is not so important for 26 tube...
I agree! While you are at it you might want to try a pure choke input filter. I am using LCLCLC for preamps with the last LC separate for each channel

Best regards

Thomas
__________________
http://vinylsavor.blogspot.com/
  Reply With Quote
Old 3rd April 2013, 05:23 PM   #3125
diyAudio Member
 
Join Date: Aug 2005
Quote:
Originally Posted by merlin el mago View Post
PSU very near 26 still no noise
What are those IC? diy?
Thanks
  Reply With Quote
Old 3rd April 2013, 05:28 PM   #3126
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Quote:
Originally Posted by kevinkr View Post
About 12yrs ago I initially tried the VR150/0D3 in my early 26 based line stage design, but found the noise from the gas tube to be excessive in my application.
Kevin, did you have a CCS upstream from the VR tube, or a resistor? The CCS made a huge difference for me.
  Reply With Quote
Old 3rd April 2013, 05:41 PM   #3127
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by stajo View Post
I dont know about that but if you invite me Ill come down and listen
You are welcome
  Reply With Quote
Old 3rd April 2013, 05:48 PM   #3128
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by kevinkr View Post
Nice looking build Merlin..

About 12yrs ago I initially tried the VR150/0D3 in my early 26 based line stage design, but found the noise from the gas tube to be excessive in my application.. The plate to line transformers in question were UTC HA-133: 5:1 15K:600 which I am still using. The power amps had modest gain of about 10dB but were driving a rather efficient JBL speaker system (>100dB) wondering now whether I just had a batch of particularly noisy gas tubes.. (NOS) My opinion at the time was that it was almost quiet enough and had the speakers been about 6dB less efficient all would have been well.

My current speaker system is also over the 100dB mark so all of my electronics have to be extremely quiet.
Thanks Kevin, today I experimented with mobile phone at less than 1 cm of the 26 = no noise, is incredible I was afraid of microphony and noise because all people in the thread told like a characteristic of 26. Can be your VR150/OD3 aren't good or I'm using other power transformer+choke (Bartolucci) also can be the OPT I'm use Lundhals LL1660, do you use Rod Coleman heater regulators?

You are right my speaker system have 94dB and also all my eletronics have to be quiet.

Greetings
Felipe
  Reply With Quote
Old 3rd April 2013, 05:55 PM   #3129
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by rclourenco View Post
What are those IC? diy?
Thanks
Do you refer to those red marked? if yes are the filament resistors.
Attached Images
File Type: jpg 26.jpg (746.9 KB, 351 views)
  Reply With Quote
Old 3rd April 2013, 07:03 PM   #3130
diyAudio Member
 
Join Date: Aug 2005
Quote:
Originally Posted by merlin el mago View Post
Do you refer to those red marked? if yes are the filament resistors.
Sorry, didn't explained well.
I mean IC (interconnects), these withe.
Thanks.
  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



New To Site? Need Help?

All times are GMT. The time now is 03:27 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