I am rebuilding an old RF Amplifier and need to replace some capacitors.
The markings on a couple of the disc ceramic capacitors are 4 lines of info.
They are: MDC, 100M, N1500, 5kv
I know the 5kv means 5000volts. I think the N1500 refers to the material.
What I need to know is the cap value. Is it 10pf 20% tolerance. Or maybe 100pf, 20%.
I measures it with a multimeter that has a CAP position on it and it measured .22 nf. Not sure of accuracy of meter.

I also have another disc ceramic that I need to indentify.
Is has : MDC, 1000M, X5B, 12kv.
Again, I think the X5B refers to the material, and the 12KV is 12000volts.
But what is the cap value? 1000pf?

Any help would be appreciated. Thanks.

 

N1500 is a temp coefficient marking.

this may help
http://193.6.189.120/letoltes/HG0MAT/kondi.pdf

 

I am rebuilding an old RF Amplifier and need to replace some capacitors.
The markings on a couple of the disc ceramic capacitors are 4 lines of info.
They are: MDC, 100M, N1500, 5kv
I know the 5kv means 5000volts. I think the N1500 refers to the material.
What I need to know is the cap value. Is it 10pf 20% tolerance. Or maybe 100pf, 20%.
I measures it with a multimeter that has a CAP position on it and it measured .22 nf. Not sure of accuracy of meter.

I also have another disc ceramic that I need to indentify.
Is has : MDC, 1000M, X5B, 12kv.
Again, I think the X5B refers to the material, and the 12KV is 12000volts.
But what is the cap value? 1000pf?

Any help would be appreciated. Thanks.

You should assume your values are in pF, so 1000M is 1nF +/- 20%

 

You should assume your values are in pF, so 1000M is 1nF +/- 20%

Thanks!
I think that you are correct and I will go on that assumption.