Help identifying vintage resistors wattage rating. - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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
Thread Tools Search this Thread
Old 7th May 2013, 04:49 PM   #1
diyAudio Member
Join Date: Oct 2012
Default Help identifying vintage resistors wattage rating.

Hello! I'm rebuilding an old amp and I'm having a little trouble identifying the wattage of one of the resistors I need to replace. I know some of you have been around these long enough to quickly identify by photo so I've got one here with a quarter for size reference:

Anyone have an idea? I'd appreciate any help I could get.
  Reply With Quote
Old 8th May 2013, 06:10 AM   #2
Stixx is offline Stixx  Germany
diyAudio Member
Stixx's Avatar
Join Date: Sep 2003
Location: Southern Germany
This is quite a hefty looking unit... I'd assume it is rated at 5W but older resistors usually had lower ratings. So to call it safe make it 3W. This one doesn't even look as if it needs to be replaced...
  Reply With Quote
Old 8th May 2013, 06:28 AM   #3
diyAudio Member
dchisholm's Avatar
Join Date: Mar 2011
Location: St Louis, Mo
How "old" is "old"? That looks like the construction of early metal film or metal foil precision resistors from the 1950's or 60's. Despite their size, power ratings weren't very high so your unit may be only 1/2W or 1W. (Being precision parts it could be that power rating was based more on resistance tempco due to self heating, rather than the power that would cause permanent damage.)

I have to agree with the other comment: Visual appearance doesn't suggest replacement is necessary. Except you may have already clipped the leads too short.

  Reply With Quote


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
impedance and wattage rating.... jimbob212005 Multi-Way 18 10th March 2009 03:49 PM
Wattage of vintage resistors ? nio101 Tubes / Valves 14 16th February 2009 08:40 PM
Does anyone know the power rating of vintage dog bone resistors? tom1356 Parts 4 12th January 2007 07:28 PM
help with wattage rating of coponents in crossover piro Parts 6 6th July 2005 07:15 AM
? Parrallel Resistance and wattage rating Hybrid fourdoor Parts 2 23rd April 2004 12:12 AM

New To Site? Need Help?

All times are GMT. The time now is 12:21 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2