>>I remember reading that one
>>must accept the fact that the AC voltage across the tune C can end up
>>being twice that of the plate voltage.
>>
> Not if one uses a DC blocking capacitor. When such an amplifier is
>tuned correctly the peak anode swing is slightly less than the anode
>supply potential. // The RF peak volt rating of a vacuum tuning cap. is
>60% of the DC rating.
Hmm...OK was this an error in the ARRL handbook? I'll check again but I
thought it said that if you use a blocking cap, the RF voltage could be
twice the DC across the tune C and if you used no blocking cap that the
cap would effectively have to be rated at effectively 3 times the DC
voltage. Maybe I am mixed up or maybe the handbook (1989) is incorrect.
73,
Jon
KE9NA
--------------------------------------------------------------------------
Jon Ogden
jono@enteract.com
www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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