Well, based on what I hear on my secondary radio the audio is clean.
From the directions below I think 7 watt max input carrier means 7 watts dead key max but I'm staying more like at 4 for now.
I need to spend some time working out where to set the RF power and mic gain on the Lincoln II+ to safely work with this amp. The Lincoln has a measured 30 watts PEP SSB maximum so that's below the amp's 40 watt max. The Lincoln also has about 8 watts AM max but it can be turned down as low as 1 watt.
And now that I have a decent PEP meter I may be able to safely run the Anytone 5555N II with the amp as long as I obey the amp's rules. We'll see since the Anytone has just over 60 watts PEP SSB which is about 20 more than the amp ever wants to see as its max. I'm going to be quite conservative with this one.
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I also discovered that the amp's fan is quite loud so I will definitely need to move to a few feet further down the bench and maybe on a shelf below. Either that or I could try using a set of noise-canceling headphones and see how they work with the fan noise. The radio room is in a cool finished basement that stays at about 66 degrees so cooling should not be a big issue.