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Re: [TowerTalk] HN-31 Heathkit Dummy Load

To: <jcowens@NETSCAPE.COM>, TowerTalk <>
Subject: Re: [TowerTalk] HN-31 Heathkit Dummy Load
From: Pete Smith <>
Date: Tue, 04 Apr 2006 14:39:36 -0400
List-post: <>
At 12:22 PM 4/4/2006, jcowens@NETSCAPE.COM wrote:
>Is anyone familiar enough with the HN-31 Heathkit Dummy Load (History 
>Lesson)to know how much power you can run to this thing in other than "key 
>down". I don't know if it has transformer oil or Mineral Oil in it. Will it 
>handle 1500W on a 50% duty cycle for a short time?? Does anyone know where I 
>can buy transformer oil, or has OSHA outlawed it by now??
>John Owens - N7SEJ

I believe it is the same as the MFJ-250 which has derating curves for both 
transformer oil and mineral oil.  The transformer oil is rated good at 1000 
watts for 10 minutes continuous, mineral oil for about 650 watts for that 
period of time.

73, Pete N4ZR


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