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 18th April 2013, 11:47 AM   #1
Haman47 is offline Haman47  Australia
diyAudio Member
 
Join Date: Mar 2013
Location: Adelaide South Australia
Default Joining output windings

I have picked up an output transformer in which the secondary appears to have been made with 4 independent 4 ohm windings. If the transformer is to be used to drive an 8 ohm speaker then should I join all of the windings in series then tap it across 2 of the windings, or should I just join 2 of the windings to make 8 ohms and ignore the other 2 windings? Also, when joining windings, do I have to make sure they are in phase with each other, and if so, how?
  Reply With Quote
Old 18th April 2013, 12:18 PM   #2
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Four independent '1 ohm' windings is more likely. This is how Sowter often do their transformer secondaries.

All in parallel give 1 ohm.
Two parallel pairs, then connected in series, give 4 ohms.
Two in parallel, connected in series to the other two, give 9 ohms.
All in series gives 16 ohms.

Using windings in parallel reduces resistance for the lower impedance options.
Correct phasing must be used - colour coding is the usual option, or use an AC meter.

For 8 ohms you can use either the 4 ohm or 9 ohm setting.
  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
Joining 2 Heatsinks henryve Construction Tips 1 26th November 2012 01:27 PM
Joining two MDF for the baffles qguy Construction Tips 18 16th September 2011 03:59 AM
Joining the Community BATSEARS Introductions 7 19th May 2011 06:00 PM
Joining two NCT transformers Sasquatch Tubes / Valves 3 23rd February 2007 01:53 AM
Joining the T-amp community ackcheng Class D 7 19th March 2006 02:43 AM


New To Site? Need Help?

All times are GMT. The time now is 08:26 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