[Elecraft] KPA500 going into standby

[Jack Brindle]

The original poster indicated that his KPA500 was reporting 10 amps at 61 volts. That gives a calculation of 610 watts input power.
The amp was indicating 400 watts out, which means an efficiency of 65.6%, which is within the realm of believability for the KPA500.

Not bad for our cute amplifier, eh?

- Jack,  W6FB


> On Apr 27, 2015, at 2:54 PM, Scott Manthe <scott.manthe at gmail.com> wrote:
> 
> Except that the output transistors run on 70 volts... 10 amps x 70 volts = 700 watts input, no?
> 
> 73,
> Scott, N9AA
> 
> 
> On 4/27/15 5:46 PM, Ross Primrose wrote:
>> Last I checked, 10A at 120V was 1200W....
>> 
>> 73, Ross N4RP
>> 
>> On 4/27/2015 5:41 PM, Milverton M. Swire via Elecraft wrote:
>>> 400 WATTS Divided by 10 Amps input current?!!!!
>>> The maths doesn't compute.
>>> 
>>> ((((73)))) Milverton.
>>> 
>>>       From: Jack Brindle <jackbrindle at me.com>
>>>  To: tnnyswy at yahoo.com
>>> Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>>>  Sent: Monday, April 27, 2015 4:26 PM
>>>  Subject: Re: [Elecraft] KPA500 going into standby
>>>    I think you will find that 10 amps is about right for 400 watts. The KPA has incredibly good efficiency,
>>> upwards of 60% or so, which supports the value.
>>> 
>>> - Jack B, W6FB
>>> 
> 
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