• It's a diode yo...
  • That looks like a designation for a specific circuit card. The identity of the specific card depends on the manufacturer. E.g., the transport card for a Northern Telecom DMS 100 transport frame is a 6X50.
  • It is a germanium diode - used to detect and discriminate RF (radio) signals. It is probably THE most common one used in DIY/educational radio kits. Some of the kit manufacturers use the diode number as the part number of the kit also, so it could also be the number of an entire radio kit, using the 1N34A in the circuit. I use to look up just about any electronic part and get it's Datasheet which has the part description and usually some sample circuits. They also have some complete circuits referenced by the number on the circuit board.

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