[TowerTalk] TowerTalk Digest, Vol 40, Issue 10

George Lee geokr5c at cablelynx.com
Wed Apr 5 00:39:04 EDT 2006

John, my HN-31 manual shows "Power Dissipation Capability........1 kilowatt 
maximum (IC AS)."

The oil in it can be whatever the original owner put in it.  Oil was not 
included.  Mine has transformer oil as I built it 34-35 years ago.

The book also has a graph that shows with Mineral oil you can run 1000 watts 
input for approximately 1-2 minutes.  Hard to interpolate.  Also shows 1000 
watts input for transformer oil for approximately 10 minutes.  The lines 
converge at about 375 watts and continue as one line down to 200 watts input 
for 60-120 minutes.

Somewhere in the archives is a note about oils that are good for such 
service and can be found in Tractor Supply Stores.  I can't remember the 
formula designator but maybe someone else can or knows where in the archives 
to find it.

I have seen this oil in the store near me and it is very cheap.

Good luck.

73, George KR5C

 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

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