40W 1k Power Resistor

Does anyone know where I can get a 40W, 1 kohm power resistor? The original item was a wire wound ceramic tube about 4 inches long.
Ideally I am looking for a replacement of the same dimensions to fit in the same enclosure.
It is a field discharge resistor for a DC generator with up to 170V across the field coils. Its part of a 1950s Ward-Leonard drive system I am restoring so I want to keep the same electrical design. The local Maplin store gave me a blank look when I asked !
Thanks, Steve
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Try winding your own. If you have the ceramic tube, remove the bad wire. Buy some nichrome wire or cannibalize the wire from a toaster and do some experimenting with it. You may have to weld the ends of the element you finally settle upon to the terminals on the ceramic tube. Solder just might not make it here.
You might even look in flea markets for old high power potentiometers as a source of resistance wire.
Al
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Those big resistors are still available, although I'm not sure about an exact size match. Ohmite L50J1K0, 50 watt, 1K ohm, Allied Electronics stock #296-2845. www.alliedelec.com
When you're done, could you post some pictures on alt.binaries.vintage- engineering?
Mike
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Mike Lamond wrote:

Big thanks Mike, just the ticket !
Will also investigate the newsgroup link you gave - its new to me and could be just the ticket - on many counts ;-).
And to Al - this is a superfine wire wound on a hollow ceramic tube and then glazed over the top. The ceramic is broken in two halves and there was a piece of wire exposed though I needed a magnifying glass to see it, that allowed me to measure the resistance. I don't have the materials or equipment to recreate this. Too tricky for me !
Thanks to both Steve
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Mike Lamond wrote:

Mike,
I can find no such group, nor anything called alt.binaries. I have searched Google for groups and it assures me no such things exist. Its says All Groups > Usenet > alt.binaries - no groups match.
I am not doing this from work, its my own computer with broadband access, so what is the problem ? Is Google somehow only searching a restricted list provided by by the BT Internet/Yahoo combination that I use for access ?
Frustrating to find there is a vintage engineering group I have no access to. Maybe I'll have to find another service provider.
Steve
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

try alt.binaries.images.vintage-engineering
sQuick..
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

<snip>
You're right. I left out .images. One thing I want to do is get up to Erie Canal Lock 23 to get some good pictures of the power house and lock machinery. This is one of the locks which still has the original 230 volt DC system installed when the current New York State canal system was built during 1909-1917, complete with open knife switch on marble base switchboard. Everything still works, but now they normally use a newer motor-generator set running on utility power.
Mike
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

RS have loads that will do the job http://tinyurl.co.uk/deyx or http://tinyurl.co.uk/re3x or http://tinyurl.co.uk/fcll
sQuick..
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Those links just give you a page that says your session has timed out, but I did manage to find RCH50 on an RS web page by searching on Google, but thats not a ceramic.
I have been to the RS web page and stuck power resistor into their search box, and nothing happens, its as if it doesn't work at all. I think we have copies of the paper catalogues (or CD) when I get back to work next week - but at this rate RS will be a last resort.
Have searched Maplin and Farnells web pages with ease, but no success.
Good job I have some other leads - thanks guys !
Steve
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Look on RS with these part numbers
158-474
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Steve R wrote:

Digikey - http://www.digikey.com D50K1K0E-ND FVT50-1.0K-ND HLB-1.0K-ND They all look right, and the last one looks like the best choice. They are 50 watts. Dunno what it'll cost to ship across the pond.
Ed
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.