[AMPS] resonated input chokes

[Rich Measures]

>
>
>> from an old parts list.  Then there was a 4 uF shunt C. In the final
>> design I followed the first section with a second series L, about 3.5 H
>> (small and inexpensive) and another shunt 4 uF. This gave excellent ripple
>> rejection for even 720 Hz, and also was very well regulated due to the
>> resonant choke. It was modelled to prevent any resonances at power line
>> multiples, or at 50 or 60 Hz, in case a rectifier failed open, and allowed
>> half wave operation.
>
>In 1970, I was almost killed by a resonant choke supply.
>
>I built a resonant filter driven by a full wave bridge and a 4160 volt 
>RMS 10 kVA pole pig. All parts had a large amount of headroom, I 
>used power line power factor correction caps in the supply. 
>
>I made the choke EXACTLY resonant by following the guidelines in 
>Bill Orr's Handbook.
>
€  Rumour has it that tuning the choke to 155Hz works a bit better than 
tuning it to 120Hz.  

>When I powered-up the PA, the 3-500's arced from anode to grid 
>and the breakers dumped. Removing the tune anode connection, 
>on the next power-up a 20  kV bypass capacitor exploded.
>
€  What was the value of the bleeder R in the HV supply, Tom?


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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