Hi Bob,
There are several things that come to my mind including aged capacitor,
frontend alignment, bias and power voltage/current levels etc.
73, Berndt
VK5ABN
>
> Have recently obtained this in pristine condition .however it is down on
> sensitivity as compared to drake r4a. Have replaced valves and few high
> resistors but no great improvements any ideas ? or common faults . BOB g8acq
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