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Re: gEDA-user: B9A pin base



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DJ Delorie wrote:
>> How to put tube on a PCB (software, not the real board), anyway?
> 
> Tubes aren't special - you create a footprint using vias such that you
> have plated holes wherever the tube's socket needs them (you normally
> wouldn't solder the tube itself in).  In the case of spade-type pins,
> you'd use the width of the spade pin as the diameter of the drill
> (plus a few thou for clearance).
> 
> (see http://cgi.ebay.com.my/ws/eBayISAPI.dll?ViewItem&item=350093246441)
> 
> I think the only tricky part is figuring out *where* the nine holes
> go, without a PDF spec for the socket.  It looks like there's ten
> evenly spaced slots, so every 36 degrees?  Might want to write a perl
> script to generate the footprint, using math to figure the
> coordinates.
Coded a Perl script some time ago, doing the task. I also made a PCB
footprint, which never made it to a physical PCB, so handle with care :)
BTW: I'd suggest using ceramic sockets like these:
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=110409712742
But PCB through-hole tube sockets tend to stress the tube so the vacuum
might degrade -- at least some claim that.

CU
- - cl
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