Toasted PW tranformer? - Page 2 - 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 December 2007, 11:15 PM   #11
diyAudio Member
 
korneluk's Avatar
 
Join Date: Jan 2005
Location: South Florida
Here's the schematic, including the power supply.

http://www.tubelab.com/AssemblyManua...ematic_SSE.htm

How exactly did you configure the power supply?

-- josť k.
  Reply With Quote
Old 27th December 2007, 11:22 PM   #12
diyAudio Member
 
whitelabrat's Avatar
 
Join Date: Dec 2006
Location: Maryland
Many folks have the board switchable between solid state and tube rectification with a switch so it shouldn't be a problem. By not shorting the terminals for choosing rectification the board should default to tube rectification.

I'm thinking I should pull the solid state diodes out, but they don't seem to be shorted according to my multimeter. I'll need to take a closer look.

Check out tubelab.com for more details.

I've also got a high-rez link to a photo that should make it easy to see the wiring.
  Reply With Quote
Old 27th December 2007, 11:29 PM   #13
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Hi whitelabrat:

Remove the FRED diodes and try the amp again using the tube rectifier. There have been some issues with IXYS diodes blowing when the standby switch is flipped. They often test OK. The amp will work without them. They are only used in the SS rectifier mode, but when one dies it makes the transformer really unhappy. Unless you ran the transformer with a dead doide and no fuse for a long while it will be fine.

You should have a fuse in the circuit between the line input and the power transformer. 2 amp in 120 volt countries, 1 amp in 240 volt world.

I am 1200 miles from home, and missed the start of this thread. Just got DSL installed here, like 10 minutes ago.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 27th December 2007, 11:34 PM   #14
diyAudio Member
 
whitelabrat's Avatar
 
Join Date: Dec 2006
Location: Maryland
Thanks George!!!

A personal thanks for the awesom board and instructions! For the 10 minutes I was up and runnging... It sounded fantastic!!!
  Reply With Quote
Old 28th December 2007, 02:32 AM   #15
diyAudio Member
 
whitelabrat's Avatar
 
Join Date: Dec 2006
Location: Maryland
Ok. I yanked the Freds off the board. Rock and roll! Literally!

The solid state diodes shorted. All is well. Sounds great!
  Reply With Quote
Old 30th December 2007, 03:21 AM   #16
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
I had a very similar problem with my SimpleSE. After removing the solid state diodes, I was still using the standby switch with a JJ 5AR4 and eventually fried the rectifier tube as well. My solution was to remove the solid state diodes and also remove the standby switch. No problems since. Here is a link to a very similar problem with an EL84 PP design. Similar standby switch implementation with similar failures. http://www.diytube.com/phpBB2/viewtopic.php?t=493

Hope you don't have any more problems. Apart from this, my SimpleSE has been great!

Chris
  Reply With Quote
Old 2nd January 2008, 02:42 PM   #17
diyAudio Member
 
whitelabrat's Avatar
 
Join Date: Dec 2006
Location: Maryland
I saw the same post for the Diytube ST35 board. I just got one recently and realized that the standby switch issue applies to the SimpleSE as well. I'll be using the ST35 board for a project to salvage an old PP EL84 amp.

I've done away with the switch and the diodes on the SimpleSE and I've had reliable operation for just about a week now.

Also another thing I've discovered. I've gone around and done a sampling of the resistance of the primary side of several power transformers. They all seem to be less than 2 ohms.
  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
TDA 7250 based amplifier toasted!!!! zztop Solid State 12 21st July 2011 05:07 AM
Toasted mosfets: Anything else? lionfire17 Solid State 12 3rd October 2005 04:27 AM
Tranformer question CPX Parts 3 7th February 2005 08:44 PM
Can someone explain this tranformer? dvdwmth Chip Amps 5 9th September 2004 09:03 AM


New To Site? Need Help?

All times are GMT. The time now is 08:23 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