[sdiy] tempco contact

[Roy J. Tellason]

On Friday 07 December 2007 06:25, Louis van Dompselaar wrote:
> I've seen metal clips used in an ARP Axxe.  Not sure if they are there
> to even out the temperature
> or just to keep the transistors together.

ARP did it two ways,  one being the metal clips and the other being a drop of 
some adhesive (epoxy?) to achieve the same result.  That was for keeping 
those parts thermally coupled,  as I recall.

(I trained at ARP in the summer of 1977.  :-)

> > Years ago, I dismantled a (faulty) dBx VCA module, and I
> > noticed that the 2SC1583s inside had snug fitting aluminium
> > boxes over the plastic.  They didn't have any electrical
> > connection to anywhere that I could see (not earthed, so
> > unlikely to be for screening)), so I assume they must have
> > been there to even out the temperature across the device
> >  - so maybe where you attach the tempco might make a
> > difference.


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