[Elecraft] Question about K2 mod for optimizing it for 5W CW

[Don Wilhelm]

Alexey,

Make that change IF AND ONLY IF 1) you will never install the KSB2, AND 
2) you will not operate above the 5 watt level.

That change makes the K2 PA transistors more efficient at 5 watts and 
below, but the operation is non-linear and the efficiency is worse if 
the power is increased above the 5 watt level.

So it is not a recommended change except for those special 
circumstances.  If the major use of the K2 is CW only operation at QRP 
levels on batteries, then it is worthy of consideration.

73,
Don W3FPR

Alexey Kats wrote:
> I have one more question about K2. I noticed that revision C of K2
> manual says that if to increase QRP   T4 transfor
>
>