To glance at them they might be 1/2 watt metal-films, but that is just a guess. How many bands needed to specify the value is a function of the precision of the resistor. Sometimes there is a lonely metallic band that specifically addresses tolerance, sometimes there is a solitary band associated with the thermal drift characteristics of the device, but this can be a little more manufacturer-specific.
Laser marking came to dominate in the market later on.
Carbon resistors used to have a brown body often. These are low-inductive and cheap. They have an additional noise term as regards other types.
Blues and Greens typically indicated some sort of metallic construction. These were pretty stable. Wirewound is a type, a subtype is counter-inductively-wound types. Metal film, thin film and thick film depending, mostly on value, were naturally low-inductive.
This board is from the mid 80's, they are the way they are from many years of heat and they are not bad as far as I know cause the board is still good but I have it out so I want to replace the ones that look bad..
This board is from the mid 80's, they are the way they are from many years of heat and they are not bad as far as I know cause the board is still good but I have it out so I want to replace the ones that look bad..
