I have just acquired some old Pulso 8 heads, however I have some problems using them with Grafit pack. They would give the 2-3 second beep signal when triggered. Normally I just assume that the flash tubes need replacing. However I tried them with my old Opus pack, and they worked on one of the two Opus, but not the other.
What could possibly the fault here and is there anything I can do to make it work with the Grafit?
P.S: The Grafit pack works normally with other Pulso F/G I have