Dual-Coil Choke for Tube Preamp - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 15th July 2005, 10:57 AM   #11
CLS is offline CLS  Taiwan
diyAudio Member
 
Join Date: Jun 2005
Location: Taiwan
Red face I figure it out now

Inductor works when flux changes.
Cancelling out the flux, then there's no reactance.

I'll lookin for another solution.
Thanks for messing with my confusion.
  Reply With Quote
Old 15th July 2005, 11:28 AM   #12
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
But you have two channels and two dual inductors, isn't that enough?

PD:
http://www.jacmusic.com/lundahl/html/power-chokes.htm
http://www.lundahl.se/pdfs/datash/1673.pdf
  Reply With Quote
Old 15th July 2005, 04:35 PM   #13
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
Quote:
Originally posted by CLS
I just thought it's almost the same as a pp output stage.
It would be if the tubes were driven inverted, as they are in a PP amp. Rectifier circuits can't even show an inverted signal (it always looks like a series of humps), let alone shift the phase to make it look right. THAT is why your choke would've been useless.

Instead you have to make them bounce in sync. Dotted end of the winding to rectifier, other to caps.

Tim
__________________
Seven Transistor Labs
Projects and Resources
  Reply With Quote
Old 18th July 2005, 02:22 PM   #14
CLS is offline CLS  Taiwan
diyAudio Member
 
Join Date: Jun 2005
Location: Taiwan
Understood & thanks a lot.

I just finished the project (well, sort of).
Eventually I used them conventionally in series in the LCRC filtering.

So, that's 15H-> 220uF (with 68k bleeder), followed by individual 2k-> 1000uF for each CK5842 (with 47k bleeder).

The main transformer gives 210VAC, instead of 230 in the specs. (I'm a little confused because the output of all the rest taps are very accurate. This Lundahl unit is also very well built.... )

Via one & a half hybrid bridge by 2* 6X5GT & 2* 1N4007, I got 189V on the LC with 0.7V ripple (measured by DMM).

Then the final RC brings the voltage down to 155V with 0.52V ripple. Well, not quite up to the target, but acceptable.

I'll share the rest of the project in the Tube forum.
  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
Choke input with a field coil. lochness Power Supplies 3 4th July 2008 01:50 PM
First DIY job: Dual Tube Recording Preamp neoific Tubes / Valves 82 21st December 2007 04:54 PM
Output coupling - Choke-coil method? danielle Tubes / Valves 3 15th February 2006 09:57 PM
Dual Coil Resistor/Atlas loudnclear Subwoofers 3 12th March 2005 02:46 AM


New To Site? Need Help?

All times are GMT. The time now is 04:03 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