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?While I can't comment on what happened exactly to your amp, I will say that tube amps are much more forgiving of SWR being a little high. I have been using the Palstar HF auto tuner for a year now with an AL80A amp and didn't? really have any issues. This weekend I picked up the LA-1K and got it home and put it in line. Noticed right away that my SWR on the same antenna seemed a bit higher than normal. I put the LA-1K in stand by and hit the tuner with some RF and noticed it wouldn't get the low match as before. I had to put the tuner in manual mode and tune it. After I did this, the amp and tuner were happy and everything went well for the rest of the afternoon.?

?It sounds like your amp may need a trip back to Palstar for some new transistors.?