Currently Being ModeratedApr 20, 2012 5:40 AM (in response to edstar1960)Re: HD500 Tube Compressor Noise using Mic
Never tried it myself but in general: compressors do tend to bring the background noise level up quite a bit. If your input (guitar or whatever) is hummy, hissy or otherwise noisy then that will usually be more audible.
Have you tried the other compressors? Do you get the same thing? It may just be that the natural EQ within the Tube Compressor is boosted at the frequencies where your mic is making noise.
Play with the Mic trim and compressor settings also. Try another Mic if you have access to one.