Threshold S550E Amplifier Issue

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I purchased a nice S550E Amplifier about a month ago. It sounds great all around. However, I have noticed that it gets a lot of transformer vibration on startup that usually subsides after about 5-7 seconds. I believe this is the transformers charging the filter capacitors. Once the amp is warmed up, I can hear a very low sounding buzz that reminds me of a ground loop sound, but I am using the same outlets and power filtering. This amplifier has never been serviced and the cans and rectifiers may be overdue for a refresh. I am not a pro, but can solder and have adjusted bias on Thresholds before with success. I will likely take it to a good repair technician but ai need recommendation's on what type and specs for the filter capacitors(6) and the rectifiers, as I understand those should be replaced as well. Any recommendations are greatly appreciated. Thank you.
 
^ No, it was suggested that you'd get more replies in the Pass Labs forum. You were not told to start a new one. The existing thread is in the Pass Labs forum. The mods may have moved it without notifying you.

Just leave this one alone and/or click the report button and ask the mods to close this thread for further replies.
 
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