Simpson model 260 series 6 Multimeter which has a 2000
ohms/volt meter movement is
housed in a Bakelite case. It was given to me by Ian Powell who had no further use
for it.
I soon discovered that would not work on any of the ranges and the battery connector for the 9V battery was corroded and on opening it up that the 2 Amp fuse was missing. By checking the resistance of the meter I found that movement was functioning. The instrument worked on the AC voltage ranges when the 2Amp fuse holder was temporarily bypassed but the DC and ohms ranges showed no sign of life. A quick look at the circuit board revealed that the re were a couple of burnt out resistors that would need replacing down in the bottom left hand corner , but the value had they had been a and what was their function was not resolved until I had found the schematic diagram and component layout. Fortunately both are available on this site:http://simpson260.com which shows that these two resistors form part of the resistance measuring circuitry (1.109KΩ and 123.57Ω) though their failure would not explain the inability of the meter to work on the DC voltage ranges. Eventually having resorted to partially removing the circuit board to reveal the tracks on the underside the culprit was revealed - a burnt out track.
I spent quite some time sorting through my resistor collection to
find two that were close to the requisite values and soldered these in
place and soldered a wire link across the broken track. In my tobacco
tin containing metal spacers I found two brass sleeves which with aid
of some aluminium packing and a conventional glass fuse completed the
repair and enabled the meter to function on the DC ranges. Finally
after replacing the 9V battery connector and inserting batteries
I found that the Resistance ranges worked with creditable accuracy.
Burnt out resistors
Burnt out and ruptured
track
Modified fuse to fit internal fuse holder 
Modified fuse installed in holder
All back together with replacement
resistors
How old is it? The 260 range of meters were made for
many years but this one probably dates from around 1974/5
For lots more information and documentatio see here: http://simpson260.com/260-6/simpson_260-6.htm
