Leave them alone unless actually replacing them or separatingb them from heat sink for any reason.I'm replacing a failed Bipolar transistor in my Marantz PM40 Special Edition. A thought struck me that perhaps I should at the same time renew the thermal paste on the other three. Is this wise or should I leave them alone?
Question. If I am not really interested in maintaining galvanic insulation of a thermal grease, but I actually am interested in achieving a lower value of thermal resistance Kelvin/Watt, would it make sense to take a middle shelf thermal grease jar, say 4,8 K/W,
and mix it with nanocarbon, or at least with fine graphite dust?
As far as question from post #1 goes, I vote Nay. If it works - don't fix it.
40 year old mica washers get brittle and may fail. A reason to remove and replace even if the paste is still conducting heat.I'm replacing a failed Bipolar transistor in my Marantz PM40 Special Edition. A thought struck me that perhaps I should at the same time renew the thermal paste on the other three. Is this wise or should I leave them alone?
A specific CFP configuration that I am considering, actually has the collectors of all of the devices directly connected to the speaker output rail. So the idea is, to screw all the relevant transistors (driver and power transistors) to a copper thermal bus, which at the same time serves the purpose of a speaker output rail. Indeed, the whole rail would then be carrying the speaker output signal.Surely there is the risk that conductive paste of any type might creep from the device heatsink to the fixing screw which would result in a short to the amp main heatsink?
I hope you are changing all of them and not using ebay parts..