[Elecraft] KXPA100 SSB Distortion

[rsoifer1 at aol.com]

My KXPA100 transmits distorted audio on SSB, but works normally on CW and RTTY.  With 100 watts output, drain current is 11.7 A and supply voltage is 13.1 V, down from 13.7 V on receive.  My power supply is a pre-MFJ Astron RS-35A.


The KX3 with which I drive it operates normally on all bands and modes, with good transmit audio.  Speech compression is off and mic gain is set to 20. 


Should I send the amp back to Elecraft for service, or is there another problem?


73 Ray W2RS