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The new American Western Electric WE 403B / 403A / 6AK5 / 6J1 / 5654 / EF95 tube with square ring 403B
Western Electric 403B 6AK5 EF95 (Western Electric 403B 6AK5 EF95)
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403B, Tube 403B; Röhre 403B ID22121, Vacuum Pentode | Radiomuseum.org
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Western Electric
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Western Electric - 5591/403B - Tube, Electron. Mount: 7 Pin.
