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Query: heathkit sb-220
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Repairt a Heathkit SB-220 Linear Amplifier with a bad Plate Voltage meter -
Heathkit SB-220 Amplifier modification by KE5YA -
Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers