[volt-nuts] Dekavider DV411 repair and question

[wb6bnq]

Hi Hendrick,

I agree with David M, I also remember the POT being a 360 degree turning 
pot.  So, I went out into my storage shed to check the one I have out 
there and sure enough it is a 360 degree pot.

As for the wire, you may find that they used different wire alloys to 
provide different positive and negative tempco's.  Not sure what to tell 
you in that regard, except the less repair changes the better.

Bill....WB6BNQ


Hendrik Dietrich wrote:

> Hi List,
>
> I partially fixed a "lowly" DV411 Dekavider from the 
> "Electro-Measurements" epoque and wanted to report what worked out and 
> what still is and have a general question about such devices.
> The part in question (just look what the cheapest one on ebay was, one 
> made a power supply out of it) had a working first and second decade, 
> but the can with the 3rd switch and last decade potentiometer required 
> some work.
>
> The switch freewheeled, it didn't lock onto the right on-digit 
> position. That was due to the slotted wheel slipping on the drive 
> shaft out of position so it was no longer pressed against the 
> spring-loaded ball. I was surprised that this wheel was just soldered 
> to the drive shaft, so it was enough to push it back into the right 
> position and solder it down with some very agressive flux (Soldeen-1).
> http://dg3hda.primeintrag.org/lib/exe/fetch.php?media=locking_cogwheel.jpg 
>
>
>
> The 4th(5th) decade potentiometer seems to be electrically okay, but 
> it turns 360° instead of 270°, I consider that it had some delimiters 
> but these are scraped off. However, careful operation will be possible 
> or replacement by a potentiometer and a adapter between the thin 
> driveshaft of the switch  to the axle of a new potentiometer. (Hoped 
> to keep it original.)
>  http://dg3hda.primeintrag.org/lib/exe/fetch.php?media=potentiometer.jpg
>
> For Pronographic reasons, a overview is available too.
> http://dg3hda.primeintrag.org/lib/exe/fetch.php?media=overview.jpg
>
>
> Besides hints for further repair, does someone know which alloy is 
> used for wiring by ESI? Seems a bit hard for plain cooper.
>
> Best regards,
>
> Hendrik
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