MOTM

Thoughts below.

Richard Brewster
http://www.pugix.com

Ben Stuyts wrote:
> Hi,
>
> While waiting for the motm MOTM to arrive I'll be having loads of  
> time to think about a nice cabinet.
>
> I see that the original MOTM rails are 19" wide. But I'll be building  
> my own cabinet anyway, and somehow a bit wider looks better to me.  
> For example, the 48" wide synthesizers.com cabinets look good to me.
>   
I like mine a lot.  It is not too hard to convert one, if you can get 
the right rails.  I don't remember who, if anyone, is supplying these now.

http://www.pugix.com/cabinet_new.htm

> Also, what is a good depth? The synthesizers.com is 8.5" I see.
>   
I need the 8.5 inch depth for Blacet and other conversions.  If you have 
only MOTM modules, then half that depth should be sufficient.  The 8.5 
inch depth also allows me to mount MOTM-depth modules in front of my 
power supplies, which as you can see I mount in a non-standard way, off 
the panel.
> What do you generally do? Are there any widths (except 19") and  
> depths that can be considered 'standard'?
>   
The cabinet width is largely up to you.  I have seen a lot of 24U width 
cabinets out there.  Dot com conversion cabinets provide 26U, because 
MOTM modules are narrower than dot com.  For me that comes to an extra 
10U across all five cabinets.
> Do you always use rails to mount the modules, or is wood okay too?
>   
I highly recommend rails.  You will be dismounting modules a lot and 
wood holes deteriorate quickly.  Steel rails with good machine screws 
last a long time, and if you cross thread a hole, it can be fixed.
> Is any cooling needed? I'll probably get a 40 or 60 W Power-One  
> linear supply. With an efficiency of about 50%, that is a lot of heat  
> to get rid of. I've read on these lists that they are used by other  
> people too, with good results. Are those also used in the original  
> MOTM power supplies?
>   
Yes, MOTM supplies use Power One units.  Ventilation is important, but 
you want convection, not noisy fans.  I removed the back from my 
single-height dot com cabinets for serviceability, and this helps 
ventilation.  The big slant cabinet has a closed back except for around 
the power supply area, and a slit in front on each end of the top row, 
where end caps are supposed to go.  I have wondered if that is enough 
air flow.
> With kind regards,
> Ben
>
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