The designation of OA is inherited from old European designation system for Vacuum Tubes.
O – Cold Cathode
A – Low Current Diode
For More Details please visit this page ..
http://en.wikipedia.org/wiki/Mullard%E2%80%93Philips_tube_designation
The designation of OA is inherited from old European designation system for Vacuum Tubes.
O – Cold Cathode
A – Low Current Diode
For More Details please visit this page ..
http://en.wikipedia.org/wiki/Mullard%E2%80%93Philips_tube_designation