[Elecraft] K3 power amp 2SC2782

[Wes Stewart]

I have not observed a low power issue in my K3.  OTOH, in my experience the K3S 
PA has been a huge disappointment.  One reason for buying a K3S was a hope that 
the TX IMD would be improved with FETs.  This would no doubt have been true if 
Elecraft designed the radio for 50 VDC.

Wes  N7WS

On 1/5/2019 3:16 PM, K9MA wrote:
> I've always felt that the KPA3 in my K3 was marginal.  For example, I've never 
> been able to get more than about 80 W out of it on 15 meters. (And that's at 
> about 14.5 V) Is the KPA3A any better?
>
> 73,
> Scott K9MA
>
> On 1/5/2019 15:23, Robert Friess wrote:
>> Hank,
>>
>> The 2SC2782 is not internally matched and is the only part ever used in the
>> KPA3.  The KPA3A uses MOSFETs.
>>
>> 73,
>> Bob, N6CM
>>
>> On Sat, Jan 5, 2019 at 11:04 AM HP <pfizenmayer at q.com> wrote:
>>
>>> Anyone know if the Toshiba 2SC2782 transistors used in the K3 power amp
>>> have internal matching (mos cap and wirebonds ) ?
>>>
>>> Or did the K3 power amp ever use Motorola MRF247 transistors ?
>>>
>>>
>>> Hank K7HP
>>>
>>> ______________________________________________________________
>>>
>