[TMC] Feed thru cap

[Francesco Ledda]

I had a pass thru failed on a Collins 490T-9 once. I found replacements at Sky-craft in Orlando for $1 a piece. Different capacitance, but did not matter in the application.

Best, Francesco K5URG

Sent from my iPad

> On Aug 4, 2021, at 15:36, 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