identification - Help identifying a component in glass housing (looking like a resistor) and markings "PH 41 48" - Electrical Engineering Stack Exchange
identification - Help identifying diode - Electrical Engineering Stack Exchange
How to identify a diode which has no markings on it - Quora
1N618 Vintage Solid State Gold Bonded Germanium Glass Axial Diodes NOS USA 4/Pak | eBay