Kurt,
I doubt that the audio amp is the problem.? If you plug your headphones into the front display, is the noise level similar on EasyRTA?
Here's a link to the document that shows my measurements.? The dB scale will be much different probably than yours.? This was with the RF Gain level set at about the 1 o'clock position and volume at 12 o'clock.? Once the RF Gain is past 12 o'clock it doesn't change anything.? It's already at max gain there.
I recently downgraded from Dropbox Pro to Basic, so you probably can only view the file.? I would need your email address to allow downloading it I think.
Steve, W3AHL