Just to illuminate the difference, at 1100v B+, drawing  the requisite ART-13 300ma, a nominal voltage across the choke (choke R of maybe 200 ohms) would be 60v.  Chokes rated above 800wv cost a lot more money.  The only other gimmick is to insulate the choke if used in the B+ line. Of course, there is always the chance of shock if the choke shorts to case/lamination if no insulated safety barrier is present.  But, same scenario, voltage across choke is low, by comparison. Combat expedients....
Jeep K3HVG
On 06/02/2023 8:50 PM EDT Doran Platt <[email protected]> wrote:
 
 
I use modetn snap-on type caps, typically 4 330uf caps in series, with stabilization.  I do not use a choke for my ART-13 power supplies.  That said, one may insert a choke in the CT if you're using a CT transformer. The voltage rating can be much less as the voltage present is quite low, by comparison, to the high side.  Cheaper too!!
Jeep K3HVG
On 06/02/2023 2:15 PM EDT Hubert Miller <[email protected]> wrote:
 
 
I will need to build a power supply that gives me 1000 volts for a WW2 era aircraft radio. I have had these oil caps now for decades. But - they are only 4 mfd. Sp i am wondering, to get any useful mfd count i would have to use at least 3 - 4 of these and that weight adds up. Weight is an enemy. So i'm wondering, better to just stack up some modern lytics of the 450 volt flavor and have much less poundage? The thing with lytics tho, they do not last forever. These oil caps if they do not develop.a leak last a lot more like forever. What do you think?
I am thinking about 1000 volts not more than 150 mA. I was wondering if i could even get by without a big heavy choke. This is a CW only radio.
-Hue Miller
 
 
 
Sent from my Verizon, Samsung Galaxy smartphone
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