[Milsurplus] PE-73 Dyno starting solenoid running hot

[mac]

Jim,

No, not normal as others have said.  I've run my -73 for over an hour  
at a time with no solenoid problems.  The PE-73 does have a full-load  
duty cycle limitation.  Don't remember just what the percentages are  
but nothing close to what normal ham use would put on it.  Sounds like  
a bad solenoid to me.  Shouldn't be too hard to find a suitable  
substitute unless you insist on an original equipment replacement.

Sorry we didn't hear you last night.  Band was short.......  :^(

Dennis

*********************


On Jul 10, 2011, at 4:43 PM, Laura and Jim wrote:

> I had my BC-375 up and running for about 45 minutes yesterday trying  
> to check into the west coast MRCG net and noticed "a hot smell"  
> toward the end. I shut down and found the starting relay on the  
> PE-73 too hot to touch. Really stunk up the shack when I pulled the  
> cover. Everything else on the dyno was normal, temperature-wise  
> (warm, but not HOT). Never sounded funny. Bearings seem OK. DC from  
> the PSU is clean when I scope it. I measure 28VDC at the input for  
> the solenoid itself, 28 across the main power lugs on the business  
> end. "ON" switch on the 375 did not feel unusually warm.
>
> Is this normal? Should I be shutting down between transmissions?  
> Couldn't find any trouble-shooting or resistance/voltage references  
> in my copy of the famous 1943 manual, so I don't have a base line to  
> compare against.
>
> I want to blame it on a partially shorted starting solenoid winding  
> drawing too much current, and/or cruddy contacts.
> Or is it just a loose nut behind the mic again...........?
>
> 73 DE JIM K6FWT
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