5 pf ceramic cap replacement

[Kahuna32]

I need to replace a cracked 5pf ceramic cap on my KR-7400 amp board, but the only ones I can find are mica rated at 2kVDC and ceramic at 6kVDC https://www.mouser.com/en/ProductDetail/TDK/CC45SL3JD050DYNNA?qs=8B2B7TaMn8TakoWJQw901w== . Any suggestions?

 

[Olle]

https://www.amazon.com/PANMILED-Ceramic-Capacitor-1pF-100nF-50V/dp/B0CYQ1Z4G5/ref=sr_1_11?dib=eyJ2IjoiMSJ9.lr4YOU9iOzFc8CB51B1tuCad4gbPXFQPE-6MwWPvyJ3eW6czODl4Ssr7Q9o8IbbeXHqCiQzDPnO8m2OHy9SctgLIJS3o87VwJtJ7I3Yp7JC6_ervZHBwiSuSgbh1k5a6ePv6wdtCXWVzR-aDW5Ap9NABReR_0w_QoUCqOa9-iUwh4oYsmbvfY_WeuhHi4OfA3h37KaeFwBBXISs0Vrq1a31ZJ_x8SmXP5TnIymK2GYg.PPVRrI_eM5bCq8IPswHA2lOpuQRf-B2GH1CpfIRVVtQ&dib_tag=se&keywords=ceramic+capacitor&qid=1788923203&sr=8-11

 

[ConradH]

Low value ceramic and mica caps are typically rated quite high. Don't worry about it and just install what you can easily get.

 

[rcs16]

Use a 4.7pF standard value

 

[jobrewer1983]

Parts Connexion

parts connexion is also a good spot for parts, and usually have odd values.

 

[Kahuna32]

https://www.amazon.com/PANMILED-Ceramic-Capacitor-1pF-100nF-50V/dp/B0CYQ1Z4G5/ref=sr_1_11?dib=eyJ2IjoiMSJ9.lr4YOU9iOzFc8CB51B1tuCad4gbPXFQPE-6MwWPvyJ3eW6czODl4Ssr7Q9o8IbbeXHqCiQzDPnO8m2OHy9SctgLIJS3o87VwJtJ7I3Yp7JC6_ervZHBwiSuSgbh1k5a6ePv6wdtCXWVzR-aDW5Ap9NABReR_0w_QoUCqOa9-iUwh4oYsmbvfY_WeuhHi4OfA3h37KaeFwBBXISs0Vrq1a31ZJ_x8SmXP5TnIymK2GYg.PPVRrI_eM5bCq8IPswHA2lOpuQRf-B2GH1CpfIRVVtQ&dib_tag=se&keywords=ceramic+capacitor&qid=1788923203&sr=8-11

Have you bought these? I just purchased another set from amazon, tested all the 5pF, couldn't get higher than 4pF, tested all the 10pF, couldn't get lower than 7pF-a few at 9pF. The service manual says 5PF +- .5 Thanks

 

[RVT1K]

Digi-key has a zillion.

https://www.digikey.com/en/products/filter/ceramic-capacitors/60?s=N4IgjCBcoEwAwBYCcVQGMoDMCGAbAzgKYA0IA9lANogCsABAA4BiIAuqQwC5QgCqAdgEtOAeUwBZQtnwBXAE6EQAXxVA

 

[Kahuna32]

now click "thru hole" and "in stock" and you are left with the list of the same 26 caps that i linked above.

Oy! Thanks! I did check Digikey but must have put in a wrong value!

Just tried again, it was the freakin tolerance filter!

 

[rcs16]

https://www.digikey.ca/en/products/filter/ceramic-capacitors/60?s=N4IgjCBcpgLFoDGUAuAnArgUwDQgPZQDa4sADABywUh5hkBsZATPHWYwOwR4MCcDZnxABdPAAcUUEAGV0ASwB2AcxABfOpwQhkkdNjyFIJAMyswFE7RBnYF%2BGJCTpctEtUaQ-bbv24CxCB2Fnxajs6Qsgoq6njMZLDC0DqomP5GJLAAdBQABOIAYtbZfPlFeACsZcVZnNXhUpEAqoryKADyAGYAslgAhgDOGGhY6p4M2vIAJtIAtGA8To0g1igAnuKjkWNAA

 

[dtvmcdonald]

now click "thru hole" and "in stock" and you are left with the list of the same 26 caps that i linked above.

But you don't need to use "thru hole" ! buy a chip cap, cut off the leads of the old one and solder to the chip!
Or if you removed the old one's leads, just use some solid wire of the proper length.

 

[arts]

For 5pF? Take the easy way out and google "twisted-wire gimmick"

 

[JyriK]

But you don't need to use "thru hole" ! buy a chip cap, cut off the leads of the old one and solder to the chip!
Or if you removed the old one's leads, just use some solid wire of the proper length.

Or solder them on the foil side without leads (if long enough).

 

[nj pheonix]

The USB-C (or lightning if you use an older iPhone) to 3.5mm adapters have their own little tiny DAC built into them.
for example, this $10 adapter has a DAC chip built into it:
View attachment 3816029
What kind of phone do you have?

For 5pF? Take the easy way out and google "twisted-wire gimmick"

That's cool!. I understand the principle but never would've thunk it.

 

[gadget73]

. I've seen "gimmick" caps in a number of pre-war radios up in the tuner section to fine-tune some value or to couple oscillators to the mixer. Not sure if they just didn't make those low value caps or if it was simply more cost-effective to make them to value as needed, but it certainly works.