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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
 Heathkit SB-220 : Radio Equipment/HF Amplifiers/Heathkit SB-220
Heathkit SB-220 and SB-221
Heathkit SB-220 is listed on dxzone.com since 2007-08-27
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