[TCML] vttc issue power supply arcing during staccato mode

[earl rhodes <earl_1975@xxxxxxxxxxxxx>]

hi 
i spent all last night sorting out my staccato for my coil tested it first thing this morning and it does indeed work !!...but  every time theres a spark or enough voltage coming in to cause the smallest discharge there is arcing between the primary and secondary of my power xfmrs 
both of them in exactly the same place  they are going between where the filament winding for the magnetron is and the primary  
it is not a destructive arc it is id say about 10 maybe 15kv by the looks of it and it is very persistent it happens every time theres a spark
a look at the output waveform of the coil on an ungrounded probe to air it is what you would expect really a smooth gain in voltage followed by a quick dampening down  no unusual sighns
 no spark on the output but i could still hear the arcing going on on the other side of the xfmrs so it has no effect on the output  
 siince the test my switching device (a mosfet) has died a quiet death  due to testing after checking out the connections to ground and checking my rf bypass was ok which it all is  and the fault was still present
 so the mosfet was probably badly over voltaged but since the mosfet went and normal operation was restored the fault dissapeared  so its only happening when the tube connects or disconnects i have no way of telling which way round it is
can anybody help 
earl

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