SB-200 High value Capacitor info
To add an extra capacitor to the high-voltage (HV) line on the Heathkit SB-200 amplifier for additional filtering or bypassing, the recommended specifications based on documented modifications are: Capacitance: 4.7 nF (which equals 4700 pF ) Voltage Rating: 3 kV (3000 volts) or higher This modification involves placing the capacitor in parallel with the existing 1 nF capacitor from the bottom of the anode choke to earth ground. It is intended to increase output on the 80-meter band and provide additional filtering. Some builders opt for even higher voltage ratings (4–5 kV) for increased safety margin given the SB-200’s HV supply can exceed 2500 VDC under load. Heathkit SB-200 high voltage capacitor mod View all SB-200 HV line capacitor upgrade 4.7nF 3kV View a If placing the capacitor near the glitch resistor (typically across the HV line to chassis ground immediately after the resistor or at the power supply output), the specifications remain consistent with th...