Out Of Order - 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 27th May 2004, 06:07 PM   #1
alk is offline alk  Europe
diyAudio Member
 
alk's Avatar
 
Join Date: Apr 2004
Location: tiny place
Default Out Of Order

hi,
My tube amp was working well until I plugged in a defective guitar booster.
my trafos give me 220v as before but after bridge rectifying i get 680v AC!!!!!
I don't get it, i am just a DIYer not a tech. Can somebody help? I have bought another bridge but i must now what has happened - safety reasons.
Also as i had 400v max. caps and they went up to 600v and more,
should i change them all?
I fear for my OT's.
Thanks
  Reply With Quote
Old 27th May 2004, 06:11 PM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
You probably lost your rectifiers and possibly the filter capacitors.

If you're not experienced with high voltage work, DON'T MESS AROUND WITH IT, let a competent tech do the work. Electrocution and explosions are entirely possible.

The good news is that your OPTs are probably OK.
__________________
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 27th May 2004, 06:18 PM   #3
alk is offline alk  Europe
diyAudio Member
 
alk's Avatar
 
Join Date: Apr 2004
Location: tiny place
Thanks
  Reply With Quote
Old 27th May 2004, 10:58 PM   #4
EC8010 is offline EC8010  United Kingdom
diyAudio Moderator Emeritus
 
EC8010's Avatar
 
Join Date: Jan 2003
Location: Near London. UK
Default Right out of order

Quote:
Originally posted by alk
Also as I had 400V max. caps and they went up to 600V and more, should I change them all?
Yes, you should. You have stressed them. They might not blow up immediately, but their lifetime has been drastically shortened. They need to be replaced. Find an experienced person to fix it...

("Right out of order" = "You shouldn't have done that.")
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
  Reply With Quote
Old 27th May 2004, 11:12 PM   #5
alk is offline alk  Europe
diyAudio Member
 
alk's Avatar
 
Join Date: Apr 2004
Location: tiny place
I've installed a new bridge and still no DC coming out. I get 440v AC in my multimeter. How this can happen? I'm lost, my multimeter works well in other readings. What the hell is going on?
How a 230v trafo can give 440v AC after rectifying is a complete mistery to me.
  Reply With Quote
Old 28th May 2004, 07:50 AM   #6
SHiFTY is offline SHiFTY  New Zealand
diyAudio Member
 
SHiFTY's Avatar
 
Join Date: Jul 2002
Location: New Zealand
You may have fried your multimeter. I killed one with 700VAC once, it gave very strange readings.

Take the amp to a tech.
  Reply With Quote
Old 28th May 2004, 11:57 AM   #7
alk is offline alk  Europe
diyAudio Member
 
alk's Avatar
 
Join Date: Apr 2004
Location: tiny place
Hi,
yeah i suspected the multimeter went wrong. I've done some testing to find out it doesn't read DC anymore, now all is AC. Having said that, my problems are not resolved. Now i have 440 v
DC where it should be 280v. Volts readings are ok. It reads my house 230v accurately and i tried with a dc transformer that i got and it reads 12v well but instead of dc gives ac which is what is wrong with my multimeter.
So give the high voltage ? It is a 230v trafo.
  Reply With Quote
Old 28th May 2004, 01:14 PM   #8
alk is offline alk  Europe
diyAudio Member
 
alk's Avatar
 
Join Date: Apr 2004
Location: tiny place
Proof.
Attached Images
File Type: jpg multimeter.jpg (94.5 KB, 143 views)
  Reply With Quote
Old 28th May 2004, 07:51 PM   #9
alk is offline alk  Europe
diyAudio Member
 
alk's Avatar
 
Join Date: Apr 2004
Location: tiny place

Forgot about my multimeter, changed bridge, replaced caps and voilá....sweet music playing
Thanks to all those who helped. Tubes are great.
  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
1st order Passive Line Level Crossover + 2nd order Highpass? alexclaber Multi-Way 11 4th January 2008 07:15 PM
deceptive perception ? 1st order-2nd order question poldus Multi-Way 4 10th April 2007 11:58 PM
My 1st order butterworth filter better than 4th order L-R: Why? philipreji Solid State 61 1st March 2007 04:50 PM
2nd Order Tweeter + 3rd Order Woofer = OK? Jay Multi-Way 3 12th September 2005 12:12 PM
1st order ? L-R 2nd order? or transient perfect?? Ken L Multi-Way 6 17th October 2003 04:22 PM


New To Site? Need Help?

All times are GMT. The time now is 01:31 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