No, remove R10 and C2.
Replace, where R10 was located, a 100nF capasitor.
[link=http://www.test.gompy.net/delay%20schematics.jpg]Changing trigger[/link]

[update 09-12-2005]

The triggerpuls wasn't strong enough with the capasitor I was used.
I change the schematic of the delayschematic - see link.
Now the triggerpuls is 4 Volt to the thyristor.
I have still some problems with the highpower.....only 400 Volt and if I connect the ignitioncoil the power dropdown to zero Volt.