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Query: heath sb 220 amp
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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