[Elecraft] Fw: Strange loss of output...

[Ron W]

 Hi again,
              I will be able to answer my own problem it appears...I took
the
 set apart and checked the soldering on the toroids in the 20/30 BP and LP
 sections (even took them out to check the tinning). No problems there, so I
 resoldered all connections in the immediate area. Put it all back together.
 Still the same. ie. only 5w max out on 20m.
 Remembering past messages about variable trimmers and "seating" them I
tried
 spinning the trimmers a few times, had another go at tuning the filters and
 it worked. I now have much the same output on all bands. I just have to
hope
 it doesn't change again, but if it does I know where to look.
 Cheers.....Ron ZL1TW


 > Hi all,
 >          I wonder if anyone can suggest what might be wrong here.....here
 is
 > the scenario:
 > For a while now the power out on 20m has been low. Today I can max about
 35
 > watts, so I took the long suffering K2 apart and went through the
transmit
 > alignment again, put it all together. No change.
 > I then removed the KPA100 completely, powered the set from the old "QRP"
 > jack and looked again.
 > I can set the L8 and L9 for max power output on both 20 and 30m as
 > described. No problem there. I then peak C21 and C 23 for max power .
Once
 > again no problem.
 > I can up the power to 5 watts and all bands show the same output on the
 watt
 > meter.
 > I set the power level to 10 watts and all bands show 10 watts (near
 enough)
 > *EXCEPT* for 20m which still shows 5 watts.  I just can't get 20m to give
 > any output above 5 watts.
 > I guess a problem like this reeks of dud soldering on a toroid (?) , but
> if
 > 30m ,( which shares the LP and BP filters) is fine , then where?
> Having posted this I will go over the connections of the BP and LP
> filters,
 > ....and that means taking off that gosh-awful heatsink panel
 >
 > Any ideas appreciated in the meantime.
 > Cheers......Ron ZL1TW
 >

>