Description:

Lot of 10 Cornell Dubilier (CDE) Type CM4 high-reliability dipped silver mica capacitors, marked CM4ED 200J0 (as shown). The CM4 series is a compact, high-stability silver mica line designed for military and high-performance industrial use. These are excellent for precision RF/IF circuits and vintage restoration where low loss and long-term stability are critical.

Marking notes (important):

- “200” is the capacitance code, representing 20 pF (20 x 10^0).

- “J” denotes a standard ±5% capacitance tolerance.

- “0” is a stability and temperature coefficient notation (typically C0G/NP0 style).

- “ED” in this series indicates a 500 Vdc working voltage (please verify for your specific application).

Modern uses:

- RF/IF tuned circuits, filters, and high-frequency oscillators

- High-precision analog timing and compensation networks

- Vintage communications and lab equipment restoration

- High-stability impedance matching in HF/VHF circuits

Compatibility note:

Please confirm capacitance (20 pF), tolerance (±5%), and working voltage (500V) for your design before installation. These military-grade silver mica parts are exceptionally stable but exact ratings should be matched to your circuit requirements. Check lead spacing and body size for fit.