THE SIGMA XR-3000D LINEAR AMPLIFIER
This amplifier was a sleeper. It is a dual 3-500Z type with separate filament and plate transformers. It was Japanese made and was promoted by small ads in ham magazines. I'm not sure the year introduced.
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THE SIGMA XR-3000D LINEAR AMPLIFIER
This amplifier was a sleeper. It is a dual 3-500Z type with separate filament and plate transformers. It was Japanese made and was promoted by small ads in ham magazines. I'm not sure the year introduced.
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