[Amps] Step-Starts

[R.Measures]

On Aug 13, 2005, at 8:06 AM, Jim Forsyth wrote:

>>> Lastly, when switching the output of the transformer from 2.5KV to 
>>> 4KV,
>>> well after stepping, (going from "CW" to "SSB"), the xfmr still makes
>>> an
>>> audible thump. Is there any protection needed at that point?
>
>> Probably not.  The high-hurdle is starting from zero V.
>
> When switching from 2.5kV to 4kV the capacitors once again look like a 
> dead
> short so now you are applying 1.5kV to a short as compared to the 
> original
> 2.5kV to a short. Not a huge difference in the two cases.

The lights blink less with a 2500v headstart than starting from 0v.   
Actually, a filter capacitor looks like a dead short 120 times a second 
during normal operation.
>
> Jim, AF6O
>
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org