[TMC] Feed thru cap

[Chris Bolkan]

Hi JohnP and thanks to all!

Peter Whittenberg (K2LRC) has located the exact part and is sending it
to me. Thanks Peter!

John Samuels- thank you too. The images you sent are NOT the part.
Your images are nice feed throughs but I cannot tell if they are
capacitors or not what is in my unit.

Thanks again everyone!

Warm regards,

Chris Bolkan
KI7NXY






On Wed, Aug 4, 2021 at 1:35 PM John Poulton <jp at cs.unc.edu> wrote:
>
> Chris,
>
> If you look the part up in the PAL-500 parts list, you'll find the P/N CK70AW202M.  This is not a TMC part number, but is the part number for a 2nf Erie CK70-style feed-thru capacitor.  They are, needless to say, no longer available.  Surplus Sales has some CK70's of higher capacitance available, but they're obscenely expensive.
>
> A bit of further searching will lead you to a company called Tusonix that still makes similar parts.  For example, there's:
>
> https://www.digikey.com/en/products/detail/tusonix-a-subsidiary-of-cts-electronic-components/2499-003-X5W0-502PLF/3116039?utm_adgroup=Feed%20Through%20Capacitors&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_Filters_NEW&utm_term=&utm_content=Feed%20Through%20Capacitors&gclid=CjwKCAjw9aiIBhA1EiwAJ_GTSqXeFZyhoMnKG4XSLhhDIDxGet3owRB-_5MDTq8KrWO_CDOMdvLkChoCBQMQAvD_BwE
>
> from Digikey.  It's a 5nF 500V unit, but physically very similar to the 2nF Erie capacitor, and in most instances in the PAL amps, the capacitance isn't critical.  Downside.. those 5nF ones are over $22..  :*(  But, they are available, and they're more or less correct replacements physicallly.
>
> There's this capacitor:
>
> https://mgs4u.com/product/feedthrough-capacitors/?gclid=CjwKCAjw9aiIBhA1EiwAJ_GTSm9tWD_xDrlwF3DRqeDdlHazRYqojROcn5buOzpqG9A19rvzrlfDExoCnF8QAvD_BwE
>
> at MaxGain Systems, for a mere 99c each!  It's 5nF @ 1KV feedthru, but is significantly smaller than the CK70's.  You might be able to fashion a little bushing to get it to work in the original hole.
>
> I have to say, I've never seen one of these capacitors fail in a PAL-350/500 amp, but there's always a first time!  If you only need one, your best bet is likely to be the parts drawers of folks on this list.  Let us know!
>
> Good hunting and 73, John K4OZY
>
>
> On Wed, Aug 4, 2021 at 11:01 AM Chris Bolkan <bolkyboats at gmail.com> wrote:
>>
>> Hi all!
>> I am looking for a 2000pf feed-through capacitor. These things are
>> used like popcorn on the PAL 350 and 500, so I assume on most TMC
>> equipment. Does anyone have one to spare? I'd like to keep things
>> original looking so want to try here before I start researching
>> current options from Digikey and the like.
>> Many thanks!
>> Chris
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