Power resistor decade box - Printable Version
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Power resistor decade box - WallaceRoger - 02-13-2018
I'm thinking about getting a power resistor decade box. I've been looking at older stuff (which is cooler), but I also found a brand new one made by our friends over in China that seems like a fair price.
https://www.ebay.com/itm/PRECISION-VARIABLE-DECADE-RESISTOR-RESISTANCE-BOX-0-9999-9-ohm/142520224558?hash=item212ede0b2e:g:Y-kAAOSwnYBaT1wu
Does anyone here have experience with this particular item? Any recommendations otherwise, maybe for vintage stuff?
RE: Power resistor decade box - Radioroslyn - 02-13-2018
That one doesn't go very high only 10K. It also doesn't mention what the wattage is for the resistor. I would guess that it has 1/2 resistor in it as does the vintages ones. If you want something that will handle more current you are probably looking at building something.
RE: Power resistor decade box - jcassity - 07-19-2018
there is a wonderful and low cost hallicrafters decade box for sale on ebay now,, 45$,, and is a very nice looking unit.
its one of those... "too much box" with very little inside it type containers that could be modified to a wayyyyyyy lower profile.
the person selling opened it up and it finally gives me a way to use up half my NOS slider switches i have.
i have so many resistors that i am going to make my own... and duplicate this layout.
I dont know why i didnt think of this design,, i was always associating what i used in the navy,, (rotary switch type) as my starting point.
the max wattage may be the only slipping point for the type / application uses we have on our heat generating sets.
i suppose you would have to just know when the decade box is applicable and when its not.
on this box,, i did not see a way to parallel resistors... meaning lets assume all these are 1/2W R's.
your sample radio says 2w 100ohms for a particular schematic need.
on the decade box i would want to select or "turn on" 5) 500 ohm 1/2w resistors in parallel to achieve 100ohms 2 1/2w..
https://www.ebay.com/itm/Vintage-Hallicrafters-HD-2-Decade-Resistor-Box-Rare-1960s-Carbon-Comp-Resistors/123014260916?hash=item1ca438a8b4%3Ag%3AtaYAAOSwlGVapTmi&_sacat=0&_nkw=decade+resistor+box&_from=R40&rt=nc&_trksid=p2380057.m570.l1313.TR2.TRC1.A0.H0.Xdecade+resistor+box.TRS0