- #1
Planobilly
- 440
- 105
Hi,
I am a bit perplexed by the codes on some old ceramic disk New Old Stock capacitors. Here are some examples.
This one measures close to 68 pf.
CM = MFG ?
U2J = ?
75J = I assume 75 pf and the J = the tolerance of 5%
1KV = 1000 volts
This one measures around 60 pf.
68J
N750
1KV
This one measures around 4.4 to 4.5 as the meter is bouncing around.
NPO
4.7D= 4,7 pf D= ? tolerance
1KV
1KV ceramics were common in old Fender guitar amps from the 1950s. I assume 1KV was common in the tube/valve era for many high voltage tube applications.
Mouser and DigiKey don't stock 1KV caps and perhaps they are not being manufactured any longer . I have been given several thousand of these NOS caps by a friend who has an old electronics business. I need to label them. If stuff is not sorted out where I can find it, it is useless...lol
Cheers,
Billy
I am a bit perplexed by the codes on some old ceramic disk New Old Stock capacitors. Here are some examples.
This one measures close to 68 pf.
CM = MFG ?
U2J = ?
75J = I assume 75 pf and the J = the tolerance of 5%
1KV = 1000 volts
This one measures around 60 pf.
68J
N750
1KV
This one measures around 4.4 to 4.5 as the meter is bouncing around.
NPO
4.7D= 4,7 pf D= ? tolerance
1KV
1KV ceramics were common in old Fender guitar amps from the 1950s. I assume 1KV was common in the tube/valve era for many high voltage tube applications.
Mouser and DigiKey don't stock 1KV caps and perhaps they are not being manufactured any longer . I have been given several thousand of these NOS caps by a friend who has an old electronics business. I need to label them. If stuff is not sorted out where I can find it, it is useless...lol
Cheers,
Billy