SM5CBW - Tubedata
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6H6, Tube 6H6; Röhre 6H6 ID596, Double Diode | Radiomuseum.org
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6H6, Tube 6H6; Röhre 6H6 ID596, Double Diode | Radiomuseum.org
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Tubes - The R-390A Frequently Asked Questions Page
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SM5CBW - Tubedata
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6H6 @ The Valve Museum
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Sylvania Technical Manual 1943
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6H6, Tube 6H6; Röhre 6H6 ID596, Double Diode | Radiomuseum.org
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Antique Radio Forums • View topic - 6H6 Tube Substitution Question
6H6, Tube 6H6; Röhre 6H6 ID596, Double Diode | Radiomuseum.org
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