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    >    Ecg 166 nte nos sylvania rectifier ECG166 6EA lot  
Ecg 166 nte nos sylvania rectifier ECG166 6EA lot
Photo is not actual photo it is a stock photo.
These are ECG ( now known as NTE) semi-conductors.
For DATA Sheet please go to NTE Web Site :http://nte01.nteinc.com/nte/ntemasterxref.nsf/$$Search?OpenForm
All the data I have on these devices are found at this Site, I do not have additional information.