[Amps] Newbie RF amp construction question

[Steve Katz]

> I'm taking on my first home-built amp. It's the Granberg Motorola EB104 
> design (600W from four MRF150s; basic circuit looks like the Ameritron 
> ALS-600). I've assembled kits before but don't have a clue about building
> a 
> heat sink from scratch. How do I go about attaching the RF transistors to 
> the PCB, copper spreader and aluminum heat sink?
> 
> //Normally, the transistors attach directly to the heatsink, using their
> mounting screws, with thermal grease between the transisor and the sink.
> If you have a copper spreader, of course that gets securely sandwiched
> between the transistor bases and the aluminum heatsink, using thermal
> grease at all interfaces, and still gets all screwed together.  The PCB
> should have holes in it where each transistor mounts.  Only the transistor
> C-B-E tabs actually attach at all to the PCB -- the base of the transistor
> doesn't even touch the board.  Sounds like you don't have the board on
> hand to look at.....-WB2WIK/6
> 
> 
> Thanks. Don November-Alfa-Six-Zulu
> 
> --
> Don Putnick
> dputnick at alumni.caltech.edu 
> 
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