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The Heathkit SB-220, two 3-500Z, amplifier made a notable impact in the world of amateur radio when it debuted in 1975. Resources and modifications

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