[Elecraft] Help with KPA 100 Alignment and Installation

[Don Wilhelm]

Les,

Check to be certain you have installed Q6 and Q7 the correct way 'round.

Second, what is the value of C31 in your kit?  It was recently changed 
to 0.22 uf to cure an oscillation that occurred in a few amplifiers with 
the new T-R switch design (Rev D manual).

The kits available in February may or may not have had the .22 uf C31 
packed.  If you have a .033 uf cap at C31, request a .22 uf cap for C31 
from parts at elecraft.com

73,
Don W3FPR

Les and Lynn wrote:
> Folks,
> 
> I solved the problem with the SWR Bridge null adjustment (CI) by reflowing a bunch of solder joints (i.e., Don's usual suggestion) around T1, R21 and R22. 
> 
> However, now I have a new problem -  I am drawing to much power in the transmit tests of on pg 50 of the KPA 100 manual. My metered Astron switching power supply shows 25 Amps on key down (2-3 sec.) at 100 watts. Calculating the amperage across R7 shows 21 Amps - still to much. Q1 seems to get preferencially hot compared to Q2 during the 2-3 sec.key down. The signal sounds great in a remote receiver. Changing the values of R26 and R27 doesn't seem to effect the power reading.
>