[Amps] 47 Ohm 5 watt

Joe nss at mwt.net
Sat Aug 11 12:46:39 EDT 2018

Yeah temp would be an issue, these will  be replacing these in a SB-220 amp.

The Original Rolling Ball Clock
Idle Tyme
On 8/9/2018 12:54 PM, Bryan Swadener via Amps wrote:
> Be careful of the temperature derating. The datasheet says they start to derate at 25°C and derate to zero at 155°C. Caddock and others produce similar power resistors.  Kanthal/Globar produces suitable single units but, I've not heard of a source for small quantities.  However, a coupla 100Ω/2W carbon composition resistors can be used in parallel. Ebay seller 'bigsmythe74' has new old stock Allen-Bradley but, he wants $4/each. Sorting by price, I see he has 91Ω/2W available for $1.25 each (http://www.ebay.com/itm/400003772794). Add $3.50/order shipping to USA.
> vy 73,  Bryan WA7PRC
> ----------------------------------------------------------------------
> Date: Wed, 08 Aug 2018 16:50:37 +0000
> From: Manfred Mornhinweg <manfred at ludens.cl>
> To: amps at contesting.com
> Subject: Re: [Amps] 47 Ohm 5 watt
> Joe,
>> I hope someone has in their parts box. (2) 5 Watt 47 ohm non inductive
>> resistors.
> Actually I do have a few, apparently metal oxide, but shipping them to
> you would cost more and take much longer than if you buy them...
> Maybe you can use this one:
> https://www.digikey.com/product-detail/en/ohmite/TNP10SC47R0FE/TNP10SC47R0FE-ND/6165413
> It's 10W, but still small enough and not too expensive. You can either
> bolt it to the chassis, or on a little aluminium sheet that acts as
> heatsink, shaped and bent to fit the space you have. These resistors
> have lower inductance than old-style "non-inductive" ones, due to their
> smaller size. Of course you destroy that advantage if you have to use
> long wires to connect them...
> Or you can assemble them from several 2W film resistors of properly
> chosen values, combined in parallel. Those are very common and
> inexpensive. Or use a bunch of even smaller resistors.
> Manfred
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