can trafo laminations rest on chassis? - 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 26th December 2008, 04:31 PM   #1
diyAudio Member
 
Join Date: Aug 2006
Default can trafo laminations rest on chassis?

I've got an old TEK LV transformer that I'd like to use as a power transformer for a project. It's large and heavy, so in an effort to lower the center of gravity of the finished unit, can I cut a square hole into the top plate and secure the transformer to the aluminum chassis with laminations resting against the top plate or is this a bad idea?
  Reply With Quote
Old 26th December 2008, 04:47 PM   #2
Klimon is offline Klimon  Belgium
diyAudio Member
 
Join Date: Apr 2005
Location: Leuven
That's how it's frequently done. To provide some sort of mechanical (vibrations) decoupling it's best to put a strip of rubber or similar between the trafo and the chassis. Then don't forget to electrically reconnect both parts of iron!

SImon
  Reply With Quote
Old 26th December 2008, 04:59 PM   #3
diyAudio Member
 
Join Date: Aug 2006
Good to know. Trick now will be to find a rubber strip narrow enough - not much room on the edge of this thing.
  Reply With Quote
Old 26th December 2008, 05:51 PM   #4
diyAudio Member
 
Ty_Bower's Avatar
 
Join Date: Mar 2007
Location: Newark, DE
That's what I did with my PT. Cut a hole and let it drop through. It's not sitting exactly on the laminations, though. There is a nut on the end of the bolt that goes through the lams. I did not remove that nut before I mounted the transformer.

Aluminum chassis might be a good idea - easier to cut, and no magnetic interaction with the transformer.

Click the image to open in full size. Click the image to open in full size.
  Reply With Quote
Old 26th December 2008, 05:53 PM   #5
diyAudio Member
 
Join Date: Feb 2008
try a mountain bike tire inner tube, just make sure the diameter is enough to cover the footprint.
  Reply With Quote
Old 26th December 2008, 07:23 PM   #6
diyAudio Member
 
boywonder's Avatar
 
Join Date: Jan 2008
Location: So.Cal.
On a related note, is there any downside to mounting a transformer as shown?

I smoked my planned "upright mount" style hammond and had this through-the-deck mount style in the parts bin, so I mounted it on standoffs.
Attached Images
File Type: jpg aikido transformer.jpg (93.2 KB, 154 views)
  Reply With Quote
Old 26th December 2008, 07:31 PM   #7
diyAudio Member
 
HollowState's Avatar
 
Join Date: Aug 2006
Location: Taxland, New Jersey
None that I can think of beyond the normal hum pickup considerations. It's perfectly legal.
__________________
"It is hard to imagine a more stupid or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong." ~Thomas Sowell
  Reply With Quote
Old 26th December 2008, 11:39 PM   #8
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Default Re: can trafo laminations rest on chassis?

Quote:
Originally posted by CarlyBoy
I've got an old TEK LV transformer that I'd like to use as a power transformer for a project. It's large and heavy, so in an effort to lower the center of gravity of the finished unit, can I cut a square hole into the top plate and secure the transformer to the aluminum chassis with laminations resting against the top plate or is this a bad idea?

If you bolt the transformer top and bottom you are creating a single shorted turn through the bolt and the chassis !

There was a warning against doing this when I recieved my transformer......
  Reply With Quote
Old 27th December 2008, 12:07 AM   #9
diyAudio Member
 
HollowState's Avatar
 
Join Date: Aug 2006
Location: Taxland, New Jersey
Default Re: Re: can trafo laminations rest on chassis?

Quote:
Originally posted by nigelwright7557

If you bolt the transformer top and bottom you are creating a single shorted turn through the bolt and the chassis !
Many transformers have a insulating shoulder washer on one end of the long bolt to prevent that when necessary. But I have also seen original transformers that do not. So I guess it depends on how the transformer is constructed.

edit: This may also depend on the material used for the bolt. Whether it is steel or non-magnetic (300 series) stainless steel.
__________________
"It is hard to imagine a more stupid or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong." ~Thomas Sowell
  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
EI laminations in Europe overdrajv Tubes / Valves 2 27th February 2009 08:09 PM
Power supply options.. bigger trafo with less caps or medium trafo with heavy caps? rhythmdiy Chip Amps 9 23rd October 2007 12:30 AM
UcD180 using Adcom 535II trafo/chassis dorkus Class D 0 16th January 2006 02:18 AM
E/I transformer laminations; why? carpenter Pass Labs 41 19th September 2005 10:05 PM
MEZZO! Transverse laminations from TAD. kidder Multi-Way 2 24th April 2003 03:03 PM


New To Site? Need Help?

All times are GMT. The time now is 05:55 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