Re: Identifying resistor types?
It seems that Carbon Composition resistors are somewhat popular again as several manufacturers are currently producing them. From the point of view of resistance value drift, looking at the data sheets there does not seem to be any info on long term stability, so it is not certain that they are any better than their predecessors such as Morganite Crucible.
Ohmite Little Demon are available from RS Components
Neohm/TE Connectivity CBT are available from Farnell
Arcol RCC are available from Rapid Electronics (cheapest)
Looking at carbon composition resistors they all seem to physically a straight tube with square ends (the leads are welded to the ends of the carbon rod, whereas the film type (and indeed most modern types) all have bulges at the ends where the end-caps are fitted over the ceramic rod on which the resistance material is affixed.
The much older Eerie carbon comps where slightly different in that the carbon was packed inside a ceramic tube with the leads fixed into the ends with a orangey-brown cement, as a result these were comparatively large for their power rating.
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