I am repairing an AVO multiminor Mk 4 which was in a sort circuit across a car battery while in the 1 amp measuring position. circuit diagram here
an obvious casualty was the 0.25 ohm resistance R1 which is implemented as a length of resistance wire of approx ( it has been cooked and burnt out ) 22SWG. The length of this wire was approx ( same excuses ) 10 inches overall
Now to my question: if I want a 10 inch length of resistance wire to be 0.25 ohm , I am looking at a resistivity of 1 ohm / meter. But nichrome wire in 22SWG is 2.82 ohm/meter ( looking at about 7cm total length which would give me quite a fitting problem. Falling back to 18SWG gets the length back into the right ballpark (18swg => 0.924 ohm/meter)
but add to the above that nichrome is a beast to solder do I have any other choice of resistance wire commonly available and easily soldered ?