[Elecraft] KPA500 max heat sink temp?

[Rick Bates, NK7I]

Then you haven't used a KPA1500.

Rick NK7I


On 7/8/2020 2:11 PM, Eric Norris wrote:
> 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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