Sounds like one of the output transistors went bad (probably open). This 
would give you half power and higher input (IC821 to amp) swr.

Regards,

    Reid, W4UPD


mikehooles wrote:
> Hi,
> my 70 cms amp has suddenly gone low power (50-60w) and the input swr appears 
> high.
> where can I get a copy of the circuit do do some fault finding and is this a 
> common problem as my IC821 with a 3 ele yagi does not have sufficient power 
> to get me onto VO-52,
> Regards
> Mike G3LGR
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