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The (5670) electron valve. It. Matters.
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5670, Tube 5670; Röhre 5670 ID3988, Double Triode | Radiomuseum.org
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Tech Notes: History of the GE 5670 Tube
Tube replacement options for Tube Magic DAC
5670, Tube 5670; Röhre 5670 ID3988, Double Triode | Radiomuseum.org
