[Elecraft] KPA500 max heat sink temp?

[Eric Norris]

Thanks, Jack!  Now the only question is, is the KPA500 a great amp, or the
greatest amp ever?  I'm in the second camp.

73.5  Eric WD6DBM

On Wed, Jul 8, 2020, 1:16 PM Jack Brindle <jackbrindle at me.com> wrote:

> I can confirm that KPA500 V1.00 firmware, which was the first released,
> had a max temperature of 90 degrees C. This has not been changed in any
> subsequent code.
>
> As for the input power, the amplifier has improved over time. My original
> prototype KPA500 requires power in the range described (about 35 - 40
> watts), while my new one (just over a year old) needs about 20 or so watts.
> Both are great amps!
>
> 73!
> Jack, W6FB
>
>
> > On Jul 8, 2020, at 1:00 PM, William Hammond via Elecraft <
> elecraft at mailman.qth.net> wrote:
> >
> > Hi Eric, My manual (revision B, 2011) that came with my SN 0149 says 90C
> maximum, page14 in the specifications.  It also says drive power 30-40
> watts for 500 out and I have never beed even close to that, usually 22-26
> watts drive.
> >
> > FYI,
> > Bill-AK5X
> >
> >> On Jul 8, 2020, at 6:00 AM, Eric Norris <norrislawfirm2 at gmail.com>
> wrote:
> >>
> >> I just read in the current KPA500 Manual that max heat sink temp is 90C.
> >> Is this true for my first-year production KPA500?  I seem to remember
> >> somethink like 75C.  I cant find my old manual.
> >>
> >> 73 Eric WD6DBM
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