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Query: heathkit sb 220
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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 -
A QST article, hints and kinks on improving the SB-200 amplifier -
IV3GFN modification and restore of an HeathkitSB220 -
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 -
Heathkit SB220 refurbishing by PA5CA