[Kenwood] TS-520SE: Distorted audio/low SSB power out

[N4EKV]

I just purchased a TS-520SE and it is producing gravelly, distorted audio on
SSB and voice peaks are only reaching 10-15 watts.  I'm using the MC-50 mic.
The rig outputs 100 watts on CW and otherwise works fine.  I've already
treated all pots and switches with Deoxit.

I came across Trio-Kenwood Communication, inc. Service bulletin no. 21
(21-10-1977) in a Google search that references common TX and RX problems on
the 520 including "Item 25. Low mic gain: Q1 2SC1000 on Gen unit."  Could
that be it?  Q1 is not a 2SC1000 according to my 520SE manual.

Or perhaps it's something else entirely.  Please advise.


73,

Adam N.
Martinez, California
www.n4ekv.com