Quote:
Originally Posted by MoxMonkey /img/forum/go_quote.gif
the BOM lists a standoff, is it the same as the one listed for the minimax?
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NO. I've had a little trouble packaging a solution that works in all cases, but I expect to have a SSMH Standoff Kit posted on beezar shortly.
The issue comes in with the washers. One washer is needed between the PCB and the standoff to provide the final spacing needed. However, all available English washers are too big - they impinge on the back lead and pad of the tube LEDs resistor. Since the standoff makes contact with the PCB ground plane (desired), this will result in a dead short. Instead, I will probably be packaging some metric washers for this use with the standoff - they are much smaller diameter. I should have the kit available tomorrow.
Likewise, the heat sink kits will be something special for the SSMH. Two extra screws, with corresponding washers, lock washer and nut are needed for the back mounting hole of the TO-3 heat sinks. Also, since the screws used on the MOSFETs go through the MOSFET, the case lid, and the TO-3 heat sink, they have to be longer than the other screws. These will all be socket-head cap screws, stainless washers and lock washers, and genuine polysulfide-filled shoulder washers for the MOSFETs. Bergquist pads will be used to complete the kit. These should be available shortly, too.
BTW, when using the Hammond case and these TO-3 heat sinks, one should apply heat-transfer grease to the bottoms of the heat sinks where they contact the case lid. I did this on both of the ones I built, but will be detailing it, along with the proper mounting holes and orientation of the heat sinks, on the SSMH website.