Blowing output transformer - 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 23rd April 2009, 11:26 PM   #1
pazo is offline pazo  Croatia
diyAudio Member
 
Join Date: Jul 2008
Default Blowing output transformer

Is possible destroyed output transformer of valve amplifier .
For example if you turn on aplifier without speaker. Push-pull desing with two 6L6 gc otput tubes.
  Reply With Quote
Old 24th April 2009, 12:25 AM   #2
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Is it possible to fry an OPT? Yes.

Running a tube amp without a load is a bad idea because the voltage swing on the primary leads can be very high.It might arc over in the output tube(s),or arc over on the transformers primary windings and ruin the OPT.Some amps may even oscillate or show other odd behavior with no load attached.

Another potential cause of a fried OPT is over current.This might happen from running the output tubes with too much bias current,or if one (or both) of the output tubes lose bias voltage,and go 'full tilt',thus running way too much current through the OPT primary and tube(s) until finally something gives. The excessive current draw may even stress the power transformer(and the rest of the PSU) to the point of failure.
  Reply With Quote
Old 24th April 2009, 03:21 PM   #3
pazo is offline pazo  Croatia
diyAudio Member
 
Join Date: Jul 2008
Thanks for explanation.
  Reply With Quote
Old 24th April 2009, 03:24 PM   #4
bigwill is offline bigwill  United Kingdom
diyAudio Member
 
Join Date: Dec 2004
Location: UK
B+ fuses are a very good thing
  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
Toroidal Transformer blowing fuses emperor Parts 15 6th November 2011 06:30 PM
Transformer fuse nuisance blowing halfgaar Parts 16 10th September 2006 11:53 PM
Velleman K4040 is Always Blowing Output Tubes GeorgeK Tubes / Valves 24 29th August 2006 05:27 PM
Leach amp blowing NPN output transistor! supernet Solid State 3 29th June 2002 12:54 PM


New To Site? Need Help?

All times are GMT. The time now is 09:46 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