Disc Cap Question

[rp]

What are you all using for ceramics discs in tone circuits? Any difference in tone btwn the better modern ones X1Y2 types and and the really cheap standard ones? Does the X1Y2 imply better quality all around or are these just more reliable where's there's high AC, which I don't care about here?

I've found the old types to vary a ton, really imprecise. Are the X1Y2's better in this regard, or are all modern disc caps of pretty high quality now? In the past I just ordered the most expensive ones from Mouser figuring they'd be higher quality. I ask now as I'm trying to save on shipping and want to get everything from one store, TubeTown, they just have standard discs though they are spec'd @2kV. Does this rating automatically make them X1Y2 types?

Anyone have any fave magic mojo discs to recommend? Fave can be, tone, temp stability, accuracy - just trying to get some knowledge.

and yes I normally prefer polystyrene but I want to have some discs on hand.

[Stevem]

All I know for sure is with any of these caps is that I always glue them down with silicone or hot glue due to all of them being microphonic when enough gain is passed thru them!

[tictac]

the caps with the X or Y designation are designed to be used at the
AC input of a power supply... either line to ground or line to line. (can't remember which is which)...

They're not meant to be used in an audio signal path... not that it couldn't be done but the cheaper disc caps are actually an integral part of the much beloved Fender clean tone.

Nearly all Black face and Silver face amps from the 60's have this type of cap in the tone circuits, signal path, and input to the phase inverter.

TT

[pdf64]

Lots of info https://en.wikipedia.org/wiki/Ceramic_capacitor
It seems that unless we can be sure that they are NP0/C0G type, then the cap value tolerance may be massive, and may be subject to wide variation according to temperature and bias voltage.
Unfortunately TubeTube don't supply sufficient info.
Too much hassle / pot luck for me.

[rp]

Good wikipedia. Learned those cylindrical ones I’ve see in old radios were caps and not inductors. Not sure still over Type 1 vs Type 2. Seems in a guitar amp it doesn’t matter much, nor if buying 5 pieces as opposed to buying a few thousand and having to budget for specs you can afford. So:

-X1/Y2 aren’t appropriate in tone circuits.

-I gather Type 1 C0G/NP0 is the tightest tolerance, least temp sensitive and exactly what I want.

-If unavailable a Type 2 Z5P would be best, unless the amp is going to Antarctica for an outdoor winter rock festival in which case an X5P?

Good advice to order exactly what I know I want from Farnell or Mouser. Maybe what i want in vintage clones is the most microphonic, lowest tolerance, most heat sensitive ones - Z4V

[ValvElectric]

I don't claim to be an expert on the topic, but I've been using C0G/NP0 and X5F ceramic disks from Mouser in my dumble-type circuits with positive results, usually dependent on which one's available in the necessary values. I also remember seeing the X5F's recommended over in the Dumble Discussions board as being similar to the ones used by HAD.
In repair/restoration jobs or vintage clones I'll usually try to use NOS disks from my collection, although I'm almost sure the Z4V's would provide a similar "mojo".

[rp]

X5F shows up a lot at Mouser etc - so what's "F"? I just have this from the wiki-p.

[ValvElectric]

That's a good question...
Here's the data sheet from Mouser:
http://www.mouser.com/ds/2/427/sseries-239781.pdf
Although after looking it over, I still wasn't able to figure it out but maybe you'll be able to decipher it better than I did.

[roberto]

This should explain the doubt:
http://www.asiapacific.com.my/capatronics/c-cap.html