Center tap or not... - 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 8th April 2011, 04:09 PM   #1
ixe13 is offline ixe13  Canada
diyAudio Member
 
Join Date: Nov 2006
Default Center tap or not...

Hi,

I need extra filaments 10 volts AC taps for 2 310A tubes, I suppose I can use a totally independant small transformer (1 Amp) from the main tranformer, and connect the 2 301A filaments in parallel?

But, does it need to be center tap? cause without the center tap it's much smaller. Not much room in the chassis

Would save me from having to buy a new power transformer.


Thanks
  Reply With Quote
Old 8th April 2011, 04:34 PM   #2
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
You can balance filament by a pair of 100 Ohm resistors. They are small. So center tap is not necessary.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 8th April 2011, 04:41 PM   #3
ixe13 is offline ixe13  Canada
diyAudio Member
 
Join Date: Nov 2006
Quote:
Originally Posted by Wavebourn View Post
You can balance filament by a pair of 100 Ohm resistors. They are small. So center tap is not necessary.
Hi Wavebourn,

Please forgive my ignorance, how can I do that?

Thanks,
  Reply With Quote
Old 8th April 2011, 04:45 PM   #4
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally Posted by ixe13 View Post
Hi Wavebourn,

Please forgive my ignorance, how can I do that?

Thanks,
Wire the two resistors in series across the filament lines, ground the center between them. Use a pair of 100 ohm 5% 1W metal oxide or similar.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 8th April 2011, 05:23 PM   #5
ixe13 is offline ixe13  Canada
diyAudio Member
 
Join Date: Nov 2006
kevinkr, cool, thanks


like this:
Attached Images
File Type: jpg Filaments.jpg (305.0 KB, 116 views)
  Reply With Quote
Old 8th April 2011, 06:31 PM   #6
ixe13 is offline ixe13  Canada
diyAudio Member
 
Join Date: Nov 2006
Quote:
Originally Posted by ixe13 View Post
kevinkr, cool, thanks


like this:
Actually it was meant as a question : Like this?

to all...

  Reply With Quote
Old 8th April 2011, 10:45 PM   #7
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Yep,like that.
  Reply With Quote
Old 8th April 2011, 11:14 PM   #8
ixe13 is offline ixe13  Canada
diyAudio Member
 
Join Date: Nov 2006
Awwwright,

Thanks guys,


  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
Center-tap Choke SonnyOneness Power Supplies 21 2nd December 2010 05:51 PM
No center tap Help FastEddy Power Supplies 57 19th April 2010 07:01 PM
Center-tap to ground? cbutterworth Tubes / Valves 3 17th January 2007 09:18 PM
Center-tap to ground? cbutterworth Power Supplies 0 17th January 2007 03:41 PM
Transformer Center Tap dswiston Parts 2 4th February 2004 03:09 PM


New To Site? Need Help?

All times are GMT. The time now is 06:14 AM.


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