One of the DC filter capacitors has gone open circuit in my Tektronix 4051. It is a SPRAGUE 9600 uF - 30VDC with a little bit unusual foot print. It might be common for other Tek equipment. Google turned up one Ebay-hit for a completed auction but that's it. Anyone has a reliable source for this type of capacitor: http://i.imgur.com/P0Nz5KW.jpg