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This is an early type germanium diode. You can use a digital multimeter with a diode check function to test whether it is functional. A good germanium diode shows a forward voltage drop of about 150...400mV, and doesn't conduct at all in the reverse direction (infinity reading).
Even though there are some special "video detector diodes", I've never seen any difference replacing them with random germanium point contact types I had on hands; you shouldn't either. If the original diode tests bad, just replace it with any germanium point contact diode. I am not good in Western types of diodes, but I think 1N34, 1N60, NTE-109 and many others should be OK.
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Last edited by Gleb; 02-01-2019 at 03:58 PM.
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