Yes. It's a small trimmer pot, about the size of a dime, that is mounted on the main board. If you can't find it, e-mail me off list. I have one with the lid off waiting for some parts after my lightning strike. I can look at it and give you better directions as to the location of that control sometime over the weekend. ----- Original Message ----- From: "Lou Kolb" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, June 02, 2011 9:07 PM Subject: astron supplies Anyone know if there is a voltage adjustment inside the Astron power supplies? I have a 35 amp supply that may need some tweaking. Thanks. Lou