[AMPS] Vacuum Cap Rating and Plate Voltage

[Rich Measures]

>
>On Thu, 16 Jul 98 14:35:10 -0500, Jon Ogden <jono@enteract.com> wrote:
><snip>
>>The handbook was correct as everyone told me: With a blocking cap the 
>>peak RF voltage is equal to the DC plate voltage.  It's without a 
>>blocking cap that you get the twice the DC voltage at peak.  So I 
>>remembered incorrectly!
>_______________________________________________________________
>That figure of equal voltage is correct when the output tank is fully
>loaded.  With very light loading and lots of drive, the peak RF
>voltage can be MANY times the DC voltage, and that's when the tuning
>cap will arc.
>
In a worst-case mistune test on an SB-220, the peak V across the tune cap 
reportedly measured 3600V  The anode supply potential was c. 2800V.  



Rich...

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


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