% error for primary resistance - 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 6th April 2006, 08:32 PM   #1
diyAudio Member
 
tenderland's Avatar
 
Join Date: Jul 2004
Location: us
Default % error for primary resistance

Hello I just recieved my output xformers and checked out the dc resistance . the secoundary are identical . The primary , one is 39 ohms
the other is 47. The spec sheet indicates 40. This is a 17% error , is this acceptable ?

thanks
J
__________________
"If every one is making wheels , why make wheels ? " Steve Jobs
  Reply With Quote
Old 6th April 2006, 08:48 PM   #2
diyAudio Member
 
Brian Donaldson's Avatar
 
Join Date: Jan 2003
Location: Texas, Love it or leave it
I think not I would expect 5% tollerance, but 10% would be acceptable
  Reply With Quote
Old 6th April 2006, 08:51 PM   #3
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
That's not terribly unusual. For less exotic winding geometries, the outer windings will have the same number of turns as the inner windings, but because they're farther from the center, the length of each turn is longer so the resistance is higher. You'll also see a bit higher leakage inductance from the outer layer, which is why you'll sometimes see compensation caps that are not symmetric side-to-side.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 6th April 2006, 09:02 PM   #4
diyAudio Member
 
tenderland's Avatar
 
Join Date: Jul 2004
Location: us
Default xformer

These are Plitron pat -3025 very expensive torodial output xformers , I would think they would be closer

so more exotic windings like toroidal should have less of an error?
__________________
"If every one is making wheels , why make wheels ? " Steve Jobs
  Reply With Quote
Old 6th April 2006, 10:25 PM   #5
diyAudio Member
 
tenderland's Avatar
 
Join Date: Jul 2004
Location: us
Default problem solved

Good thing im anal and measured the resistence , it seems they shipped one correct xformer 3025 and one incorrect 3035, the box was correct though.
__________________
"If every one is making wheels , why make wheels ? " Steve Jobs
  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
Marantz CD63 KI SIG, Error 12, Sled Error problem sisik Digital Source 1 9th November 2008 03:12 PM
Thermistor B+ or primary mashaffer Tubes / Valves 9 28th August 2008 09:07 AM
Need UTC PVM-3 primary ? PTSOUNDLAB Tubes / Valves 4 6th May 2005 04:54 PM
switchable 2.5k/5k primary ot drembo Tubes / Valves 1 16th March 2004 06:07 PM
Whats worse, 1db error in response curve or a phase error of 6? primalsea Multi-Way 5 13th May 2003 01:24 AM


New To Site? Need Help?

All times are GMT. The time now is 05:33 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