Stud mount finals

[eyecue]

Anyone have any advice on transistors like the MRF455a? This bad boy is a stud mount and the stud sticks out the bottom of the heat sink. I am wondering if it is threaded into the heatsink because if it is, this is going to be a PITA to get out. I dont want to damage the board it is on and there is a lot of parts that have to come off first if it is threaded into the sink, there is no nut on the stud pulling it down into the heat sink either.

[MDYoungblood]

No, there is no easy way around it,, you have to desolder the 4 tabs, bend them upwards as much as possible and turn it out,, that really isn't the hard part, putting the new ones in because the bending the tabs could break the ceramic. Don't forget the heat sink compound.


3's

Greg

[eyecue]

Turns out it was not threaded into the heat sink! Since there was no bolt on the stud and the whole board was held down by the transistor, it pulled away and overheated the transistor. The heatsink fins were too close together to get a nut driver on which is probably why it was not held down with a nut. Nothing a chisel could not handle. Thanks for the reply. 73' s