U67 feedtroughs...

[Greenie]

Hi. I am looking for 5 feedtrough caps like the ones in the picture, 2.2nf? I have tried to google if they are polarize in any way, but I haven't seen a good answer to that?

 

[Khron]

They're likely / definitely non-polarized.

If they were, the "+" would be pretty clearly marked on the schematic. See other Neumann schemstics, where tantalum / electrolytic caps are used (U87 for example).

 

[RuudNL]

These feedthrough capacitors are often used by radio amateurs.
(They are not polarized.)

 

[Greenie]

Any idea where to get them and what brand was used originally?

 

[ccaudle]

Something like these would be a good place to start searching:
https://no.farnell.com/en-NO/oxley/dlt-1000-rohs/cap-1000pf-100v/dp/1570089?st=feedthrough capacitorhttps://no.farnell.com/en-NO/tusoni...-300v-10a/dp/1186433?st=feedthrough capacitor

 

[Greenie]

I have the ones in the first link, but they are slightly too large, that's why I wonder if one or two could be mounted the other way around?

 

[ccaudle]

I have the ones in the first link

The first Farnell link from my post?
The datasheet for that part does not have clear information regarding the dielectric, but the symbol is definitely not polarized.
Note however that maximum working voltage is 100V, so those devices would not be suitable for plate supply lines.

 

[Greenie]

The first Farnell link from my post?
The datasheet for that part does not have clear information regarding the dielectric, but the symbol is definitely not polarized.
Note however that maximum working voltage is 100V, so those devices would not be suitable for plate supply lines.

OK. Good to know. I am stuck on where to get those feedthroughs...

 

[Whoops]

OK. Good to know. I am stuck on where to get those feedthroughs...

I have quite a few spares of feedthrough capacitors for U67 builds,
I can send you the ones you need for free, let me know if you want them.

The ones I have are shown in the photo of post 19 of this thread:

https://groupdiy.com/threads/source-fo-feed-through-capacitors-for-u67-help.80866/

 

[Hubbub]

Take a look at:
https://www.surplussales.com/Feedthrus/FTholeMnt3.htmlhttps://www.surplussales.com/Feedthrus/FTsolder2.html