Voltage rating of these caps pls?
 

The 10nF ones are marked:
A100 103K C9727

The 1uF ones are marked:
A1C 105M

I’d be interested in the manufacturer too if anyone can help

Thank you

Re: Voltage rating of these caps pls?
 

I have some identical ones here (black cased) that are 63V rated

Christopher Capener

Re: Voltage rating of these caps pls?
 

Thanks Chris, that’s great.

To be clear, is that for both types?

Cheers!

Re: Voltage rating of these caps pls?
 

I'm pretty sure the 103's are 100V types. I have seen these before used in mil spec gear in circuits running over 50V.

As for the 105's anybody's guess. For something like those I wouldn't push them over 50v. Though the A1C might indicate 100v, but unless a reference could be found, I'd not risk it. The 1 could be a multiplier and the C 100.

Re: Voltage rating of these caps pls?
 

I would have to double check, but I have fairly similar types which appear to be 100V DC but only 63V AC (which sounds sensible considering peak to peak).

Re: Voltage rating of these caps pls?
 

This is an AVX MR061C103KTA 0.3" square 0.2" pitch which looks very similar to your first cap. (10n 100v 10% X7R)
Catalog is here, details on page 32.

Your second looks like an AVX SR series but the marking doesn't make sense to me.
If I had to guess I'd say A for AVX, 1 for 100V, C for X7R (although Z5U is more usual for 1uF).
Warm the cap up to around 60C, if the capacity drops like a stone it's Z5U.

Jim