I suggest you go to http://www.febo.com/pipermail/time-nuts/  back a couple 
of years and you will find every thing you ever want to know about  the FE 
5680A. Similar to the recent Lucent activity
Bert Kehren



In a message dated 12/16/2014 7:21:02 A.M. Eastern Standard Time,  
[email protected] writes:

On 16  December 2014 at 12:16, Bob Camp <[email protected]> wrote:
>  Hi
>
> One fairly important issue - the unit needs to be on a heat  sink. If you 
run it without cooling of some sort, it will not run for very  many years.
>
> Bob

I do realize that, but how big?  Normally "the bigger the better" is
not an unreasonable rule on heatsinks,  but I have heard that cooling
these too much is bad. I have here a heatsink  about 600 x 300 x 150
mm, although I think that is a bit OTT  !!

Dave
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