Lot size four (4) J511    New diode current reg. 50v  4.7 mA 2-pin TO-92  US manufacture.

These parts are recent date code and were manufactured to fill the void left when Vishay / Silconix stopped production on their J511 several years ago.

These parts are used in the Sigma 22 power supply boards sold by Glass Jar Audio.com and are much less costly than Central Semiconductor  1N5291

Matching is available  contact me.  

Also available are J508  for the Sigma 22 power supplies.  If you need several of these please contact us.