Hi guys. I've done a lot of googling as well as searching these forums, but i can't find any information re the subject. If my transistor quotes a maximum junction temperature of 125oC , what is a reasonable temperature that the case should be without using an heatsink? I ask, as one of my transistors in a rf pa stage gets quite hot. I can only put my finger on it for about 5 seconds until it gets uncomfortable to touch. The transistor is a 40965 made by RCA, but i can't find any info about it. It was made in the 70's to early 1980's. It's also operating at approx 16vdc and drawing about 170mA. Can anyone help please?