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Registered Member #59353
Joined: Sun Apr 17 2016, 02:08PM
Location: France
Posts: 84
thank you for the advice on the photos.
there is a seller who offers film resistors for high voltage of this type, the 910k come in my budget; good or bad idea of the old resistances of the Soviet era?
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Rather than using resistors you can use inductors for greater efficiency and repetition rate. Using coupled inductors (e.g. two tall tapped helical coils, each similar to a TC secondary) you can get even greater improvements, at a cost similar to commercial e.h.t. resistors; e.g.
Registered Member #62119
Joined: Sun Feb 04 2018, 04:59AM
Location: Cedar Rapids, Iowa
Posts: 136
I have always wondered why some Marx generators use spherical electrodes. It seems that the best type would be pointed electrodes in order to promote the longest spark and most consistent firing. That is what I use on my 20-stage Marx generator.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
'pointy' electrodes wear quickly and do not break down at a constant voltage - even ignoring errosion, also, from some indirect experience and lots of reading, it is best if the u.v. emitted by each gap is allowed to 'shine' on the other gaps - to cause all gaps to fire near simultaneously.
Registered Member #62119
Joined: Sun Feb 04 2018, 04:59AM
Location: Cedar Rapids, Iowa
Posts: 136
Sulaiman wrote ...
'pointy' electrodes wear quickly and do not break down at a constant voltage - even ignoring errosion, also, from some indirect experience and lots of reading, it is best if the u.v. emitted by each gap is allowed to 'shine' on the other gaps - to cause all gaps to fire near simultaneously.
I should have been clearer. I was referring to the single "final-stage" electrode pair where the big discharge occurs, not the individual spark gaps for each stage. It seems to me that pointy electrodes would be best for this final stage in order to give the longest and most consistent discharge. This is what I use on my 20-stage Marx generator.
Registered Member #59353
Joined: Sun Apr 17 2016, 02:08PM
Location: France
Posts: 84
Hello,
Inductors are a good idea, because I can make them to measure.
But I still ordered the resistances cited in the previous post because I had more time to think, I hope not to destroy them, the power supply provides 20 kv to 15 my max.
Registered Member #59353
Joined: Sun Apr 17 2016, 02:08PM
Location: France
Posts: 84
Hello, I think I'm going to need help,
I started my generator for the first time and limited the input power to 6kv, but the problem is that after 15s, the resistance connected to the ground becomes so hot that it can not touch it anymore, I extinguish the machine so as not to destroy it, the others remain cold.
There is no short circuit, the capacitors are all OK, and the new resistors.
-Is the power supply is too powerful (a cxdz cx200c) 6-20kv, 0-15ma.
-are the resistances bad? reistor films Power: 2Watt Rated Voltage: 20KV 910 k film resistors
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choice of resistor for marx generator
