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Product 53/92 Mullard E55L=8233 near 437A,EC8020,3A/167M,6C45P,UK made!some logos!BEST USD$81.02/per piece Stock : 10+ pcs. Status : NOS Box : WB Descriptions : Mullard E55L=8223 , gold pin, black anode, long life version 10000 hour! with 'R' factory code => made by Mullard in UK in 1960s! With philips SQ logo! PS. Several different types of Logo/Text on tubes , including : Mullard / Philips SQ / Valvo /RTC / Amperex /Dario ...etc ,all made by Mullard in UK, same tubes, same sound! please email (tubes.tw@gmail.com) me first before you buy to make sure if we have the Logo/Text that you want; connected as triode, it is more powerful than WE 417A, Telefunken EC8020, STC 3A/167M , OTK 6C45P ; it can produce 1.2W (single tube amp!) with u=30! =>E55L Datasheet

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