[Elecraft] KPA100 low power on some bands

[Chris]

Hi,

I finished my KPA100 last night. Everything checks out ok except for low 
power output from the bands that use two of the filters. 17/20 and 
18/12/15. I get full power on 80 and 40 (160 untested). Less than 1W on 
the affected bands - this is as indicated on the K2 LCD and also on the 
test set - I've borrowed a Marconi 2955 from work.

SWR is shown as 1.0:1, which I would expect as the load is the test set.

K2 is working fine on all bands so I don't think it's a drive problem.

I haven't got into fault finding yet (it was very late last night) but, 
looking at the circuit diagram, I can't see anything common between 
those filters so that a single fault would cause the problem.

Is there something common to both those filters that I am missing?

Or is it more likely that I have two separate faults?

My gut feeling is to suspect the relays, but that could be because I've 
already had one faulty relay on the 160 module during this build.

Any hints?

Chris VP8BKF