Phil,
Don't be too quick to draw that conclusion.
Note that everything in the Low Pass Filter will appear to be connected
to ground at DC. If you want to make a valid DC resistance check, you
have to lift lead 4 of T4 and re-measure.
Good that you have isolated it to the base K2.
Take a good look at the toroid leads for L16 and L17. You should not
see any enamel on the solder side and there should not be a ring around
the toroid leads - that is an indication that the lead was not properly
stripped and tinned. In addition, there should be a bit of tinned lead
exposed on the component side.
It would be nice to know if the prior owner operated it on 80 meters.
The relays in the base K2 are latching type, so you can set to the band
of interest and then turn power off to make resistance readings at the
relay contacts.
73,
Don W3FPR
On 9/29/2016 6:29 PM, Philippe wrote:
Hi,
thanks Matt & Don for your messages.
The issue is located on the K2, not on the PA
I checked K3 and K8. K3 looks fine but it looks like I have a shortcut between
the pins 7-8-9.
I will get another relay and change K8.
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