[volt-nuts] Dekavider DV411 repair and question

[Hendrik Dietrich]

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