What is the minimum voltage rating you need for the anode blocking capacitor in a typical pi tuned amp? The blocking cap is C1 in the picture above.
Half the B+ voltage is enough
Usually a little bit more than the B+ voltage
A lot more than the B+ voltage (at least twice as much)
Whatever you can find and hope for the best
Answer:
Everyone answered "A lot more than the B+ voltage (at least twice as much)". Maybe they were thinking of a plate modulated stage, where the cap voltage does need to be at least twice the supply. Or maybe they were thinking that you need a good deal of margin because a failure of the blocking cap is a pretty bad thing to have happen. Really all you need though is a good reliable cap that can handle the DC supply voltage plus whatever peak RF voltage is across it , which is usually not more than a few hundred volts in a well designed amp running an anode supply of 4-8kV.
The people who answered were:
