My friend Ken says:


I'd have a look at the range from HVCA:

http://www.hvca.com/pg_catalog/catalog.aspx


The NTE548 (commonly used in microwave ovens) might do the job  - its 
rated for 750mA with PIV of 12kV.

Allegro also have a range you could look at:

http://www.allegromicro.com/skncatlg/diode/hivoltrect.pdf



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