[AMRadio] Steel chassis

Fri Aug 16 18:20:07 EDT 2013

Speaking of resistors. I need a couple of "Corn Cob" power resistors also known as "Edge Wound" for my ART-13 / ATC Power Supply build. I need a couple that are in the 20 - 30 Ohm 20 - 30 Watt range. As high as 50 W. is probably OK just from a physical size stand point.  Values are not REAL critical they're just for current limiting in the H.V. and L.V. lines to keep from dumping a lot of Filter Cap charge into the radio in case of a short. These kind take surges and the attendant heating better than normal solenoid wound power resistors.

I have a fair quantity of the 100K - 200K 200 Watt W.W. Ohmite resistors Rob mentions below that I would trade 1:1 if anybody is interested and can help.

Thanks and 73!

Bill AD5OL

________________________________
 From: Rob Atkinson <ranchorobbo at gmail.com>
To: Donald Chester <k4kyv at charter.net> 
Cc: amradio at mailman.qth.net 
Sent: Friday, August 16, 2013 12:11 PM
Subject: Re: [AMRadio] Steel chassis

I have been burned on w.w. resistors.  what I don't see much of are
the big bleeders, the 100K or 200K 200 w. w.w. resistors like the big
old Ohmites.   I buy those whenever I find them.

Rob
K5UJ

On 8/16/13, Donald Chester <k4kyv at charter.net> wrote:
> That's something I grab whenever I see one at a hamfest - chassis bases,
> both steel and aluminium.  The same with 19" panels. That is if they aren't
> too ventilated. A couple of small holes are usually OK, but I don't bother
> with something that is too  drilled up. Of course best of all is when they
> haven't been drilled at all. I  sometimes find a nice black wrinkle one
> that's still wrapped in the original protective paper and no rust.
>
> I prefer black wrinkle or maybe bare aluminium, but will take anything. I
> HATE grey hammertone. I think that's about the ugliest finish anybody ever
> thought of. But it makes a good primer to hold black wrinkle or  satin grey
> spray. I usually go over it first with a quick dash of liquid  stripper,
> not
> enough to take the paint off, but just enough to de-gloss the original
> finish so that the top  coat adheres firmly.
>
> I  won't pay a lot for wirewound  resistors unless I have an ohmmeter with
> me to c heck them. I find a lot of ones that are open, even new old stock.
> Probably corrosion eats the wire in two or opens the connection at the
> terminal rivets, just from the humidity while they sit on the  shelf.
> Sometimes I find a box full at hamfest and the vendor will take me up on an
> offer of a few bux for the whole box. I have a pretty good selection and
> usually, but  not always, can find what I need. If you need a certain
> resistor but don't have it, then it takes on value.
>
> Don k4kyv
>
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