One of the rarest 6CA4 rectifiers is this Blackburn factory Mullard EZ81 with the square top getter.  This one has the original old Mullard shield label and is Blackburn factory coded and dated 1958.  These are increasingly hard to find, and there is no better 6CA4 tube to be had anywhere.  Tested as unused on our Hickok USM118B tester.  One only!!

TERMS OF SALE: Serious bidders only, please.  Payment is expected within 3 days of auction close.  We ship by first class mail to the name and address of the winning bidder provided to us by PayPal and/or eBay.  We add $1 to the shipping to cover handling fees. Please use the eBay calculator to estimate the shipping fee before you bid. We declare the full value on the customs forms for any international shipments.  International bidders should be aware that first class mail cannot be tracked and that processing delays up to several weeks can occur in customs, which is beyond our control.