The yellow green capacitors are Philips brand capacitors introduced in the 1960's. The top markings are: Green: Temperature coefficient -330 ppm/°C. Tolerance 0.25pf or 2% whichever is larger. Capacitance value range 4.7pf to 180pf in E12 value series. Further information can be obtained in Philips Pocketbooks popular in the 1960's thru 1980's and available on Ebay for $10 to $20.

Also the black top marking on the brown ceramic indicates it is an NPO (Negative Positive Zero) Meaning its Temp Co is 0 ppm/°C at room temperature. Thus it is suitable for use in circuits where frequency or timing accuracy versus temperature change is critical, such as RF filters, Audio and RF Oscillators and Digital CMOS Crystal oscillators.

The yellow green capacitors are Philips brand capacitors introduced in the 1960's. The top markings are: Green: Temperature coefficient -330 ppm/°C. Tolerance -20/+50%. Capacitance value range 1nF to 27nF in E3 value series. Further information can be obtained in Philips Pocketbooks popular in the 1960's thru 1980's and available on Ebay for $10 to $20.

Also the black top marking on the brown ceramic indicates it is an NPO (Negative Positive Zero) Meaning its Temp Co is 0 ppm/°C at room temperature. Thus it is suitable for use in circuits where frequency or timing accuracy versus temperature change is critical, such as RF filters, Audio and RF Oscillators and Digital CMOS Crystal oscillators.