dot on germanium transistor
- tonyharker
- Breadboard Brother
A red dot or other colour dot on the side of the transistor case ONLY denotes the collector lead.
A red spot elsewhere on older transistors - usually on the top - used to indicate the goodness/gain/frequency response of the device. There were red spots - the best, white spots - good, and unmarked low gain. The manufacturing processes of early transistors was not as exact/precise as modern ones.
A red spot elsewhere on older transistors - usually on the top - used to indicate the goodness/gain/frequency response of the device. There were red spots - the best, white spots - good, and unmarked low gain. The manufacturing processes of early transistors was not as exact/precise as modern ones.