[Amps] ALS600 ALS600SPS Saw tooth ripple on 50 volt

[AJ]

Hi people.

Ok have a interesting one.

For starts I am not sure which version amp this is, it does have the 
remote ports on the front panel.

The switching power supply has a sticker of 2013 in it.

The sps schematic is unreadable, tried to find one online. None found.

Replaced the mrf150's

Have a saw tooth ripple imposed on the output (160 mtrs) have not tried 
other bands. Going to try other bands today.

Has anyone seen this before, really don't want to tear into the power 
supply if there is a simple fix.

I have tried various bias levels (150-250/device) no real change. No 
idea of what the bias should be set at nothing in the manual. Went 
online and seen all kinds of quiescence levels.

Not sure if it is rf getting into the supply or the caps on the output 
filter have crapped out or if this is normal on 160 with this amp. Have 
tried various power levels from 100-400 watts out and it almost 
disappears at the 100 watt level.

Anyone seen or had this issue?

Thanks AJ___ VE3HJ