[Elecraft] Blown fuse KPA100

[Hank Kryger]

Hi to the group

I am in the final phases of finishing my KPA100, version "C" with 
upgrade kit for "D".version.  Manual page 46 (version  C manual)  
External Amplifier Keying Test (PA KEY),

  right hand column, step 2,  "measure ground to Q9  tab.  Result  as 
noted in the manual.

right hand column step 3, Hold TUNE.  When I do this the DMM reads 3.2 
Ohm, as noted in the manual, but as soon as the reading starts, when 
holding TUNE, the Ohm reading starts to increase, at a steady pace.  At 
around 8.9 or 9.2 Ohm the fuse in my power supply, 20 Amps,  went, 
replaced it with a 25 Amps, did test again and this time the 20 Amp 
fuse in the power cord went,

There was no smoke or smell at the time this happened.   I did have my 
50 Ohms dummy Load attached to the antenna as a precaution.

Any help would be appreciated.  Thanks, Hank WA9QJH