Thread: HV PSU Question
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Old 9th Feb 2018, 4:27 pm   #1
johnyjf
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Join Date: Apr 2013
Location: Reading, Berkshire, UK.
Posts: 54
Question HV PSU Question

I am trying to build a 5KV power supply to fire up some Geisler tubes. I anticipate the current requirement will be very low, 2-3m/a at most. I have a Gardners GR118229 transformer which claims to output 4KV @ 10 m/a. It is installed in a light chassis box and when I power it up from the AC mains (no sec connections) it makes a loud hum resulting in my powering it off immediately. I have used a number of vintage transformers in the past and not had this experience. Can anyone tell me if it is normal? I took some resistance readings from the primary terminals, there are 5 of them in the standard 10-0-200-220-240 config. I get 4.2Ohms, 4.3 Ohms, 40.3Ohms and 2.3 Ohms respectively. When I measure the overall primary resistance I get 50.6 Ohms. These readings are consistent when taken by 2 digital test meters. The power is applied across the outside 2 terminals. Any comments gratefully received.
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