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List of vacuum tubes - Wikipedia
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PL 21, Tube PL21; Röhre PL 21 ID18538, Thyratron | Radiomuseum.org
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PL 21, Tube PL21; Röhre PL 21 ID18538, Thyratron | Radiomuseum.org
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PL 21 = 2 D 21 Vacuum tube Thyratron 650 V 500 mA Number of pins (num): 7 Base: B7G Content 1 pc(s) | Conrad.com
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PL21 ZAERIX THYRATRON ELECTRON TUBE = 2D21 EN91 PL2D21 QX21 | eBay
2D21 Mix Audio Vacuum Tube Valve - Bangybang
