> 9 volt dc input, 555 oscillator driving 1:500 coil, bridge rectifier and
> smoothing caps, giving a rail of 4.5kv. From this rail, 3k3 in series with
> 33nf cap to ground. Spark gap in parallel with this cap. All works fine
> runs for 20 hours in two or three 8 hour sessions. Then at switch on, some
> kind of plasma / corona effect at the wire exit of the diodes, followed by
> further breakdown. Diodes started with a Vrrm of 5kv, 5ma, and have been
> upped to 30kv, 3ma. The same problem occurs, but now takes a little
> Anti corona varnish does not help.
> I need to run the unit for sessions of 10 hours, and ideally continuosly.
> Any ideas??