[Elecraft] KPA1500 fan speeds and fan noise

[Bill Stravinsky]

 If you are going to depend on those 2 fans sucking hot air out of the amp instead of using the internal fans that push it where it needs to go, I think you arepulling hot air out of the amp and that hot air has already done its damage.
BillK3WJV

    On Monday, May 21, 2018, 3:29:29 PM EDT, Roy Koeppe <k6xk at ncn.net> wrote:  
 
 Yes it does, normally air flow is from rear to top. The fans placed over the 
exhaust vent on top create a partial vacuum, drawing in air through the idle 
(or running) fans on the rear apron and out the top just like when the 
regular fans are doing that job.

Roy    K6XK


"That doesn't move any air across the heat sink or solid state devices that 
need the air.  The air that comes out of those vents starts at the fans in 
the rear."
BillK3WJV

    On Monday, May 21, 2018, 6:07:22 AM EDT, Roy Koeppe <k6xk at ncn.net> 
wrote:

All,

My solution is two 4.5-inch, 48-volt dc muffin fans sitting on half-inch
tall rubber feet covering the top exhaust vent on amp. They are running on a
19-volt supply at a slow but effective cooling speed and are very quiet
(drawing air upward). During normal CW rag chewing the main fans do not come
on -- a vast improvement for a few bucks. When you go portable, just leave
'em home.

73,    Roy        K6XK



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