I am rebuilding a Heathkit Ho-10 and I'm looking for the high voltage
filter caps. They originals were 0.15 mfd at 1600 volts.
If the transformer really puts out 1200 VAC then I believe the caps
should have been rated at 2KV. I can not find any rated at 0.15 at 1600
or higher voltage. Does any one know of a source.

Putting lower voltage rated caps in series to achieve the required cap.
worries me because the adding voltage equalization resistors across the
caps would increase the current pulled from the marginally rated power
transformer.

My parts unit has an open primary from too much current draw.

Thanks

Jim

Current Mouser catalog shows CDE Polypro film caps .15uf @ 1600v or .2uf
@2000v. Check Mouser.com/cde catalog page 531. Not bad prices either. You
can thank switching power supplies for generating the need for HV rated
caps.

73,

Joe
K3ICO

"Jim" wrote in message
oups.com...
I am rebuilding a Heathkit Ho-10 and I'm looking for the high voltage
filter caps. They originals were 0.15 mfd at 1600 volts.
If the transformer really puts out 1200 VAC then I believe the caps
should have been rated at 2KV. I can not find any rated at 0.15 at 1600
or higher voltage. Does any one know of a source.

Putting lower voltage rated caps in series to achieve the required cap.
worries me because the adding voltage equalization resistors across the
caps would increase the current pulled from the marginally rated power
transformer.

My parts unit has an open primary from too much current draw.

Thanks

Jim

Jim wrote:
I am rebuilding a Heathkit Ho-10 and I'm looking for the high voltage
filter caps. They originals were 0.15 mfd at 1600 volts.
If the transformer really puts out 1200 VAC then I believe the caps
should have been rated at 2KV. I can not find any rated at 0.15 at 1600
or higher voltage. Does any one know of a source.

Were these originally paper or oil caps?

Putting lower voltage rated caps in series to achieve the required cap.
worries me because the adding voltage equalization resistors across the
caps would increase the current pulled from the marginally rated power
transformer.

I think that Electronic Concepts in NJ still makes film capacitors with
voltage ratings this high, but they won't be cheap. And .15 is a little
bit too high for a ceramic (and you can get plenty of ceramics at that
voltage).
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Putting lower voltage rated caps in series to achieve the required cap.
worries me because the adding voltage equalization resistors across the
caps would increase the current pulled from the marginally rated power
transformer.

eq. resistors are mostly for "leaky" caps like electrolytics. Mylar,
polypropes or ceramic won't exhibit much of a leakage at all.

I have made filters for high frequency switching power supplies out of
series ceramics with no eq. resistors.

Also made a few voltage multipliers for oscopes that lost the HV xfmer
winding. I used mylar in series, worked for years. No eq. res. there
either.

I am a big fan of eq. resistors in electrolytic applications. I would say
for this application don't worry about eq resistors.