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Product 12/45 Tesla 6X4 =EZ90=CV4005=6063=6Z31,~6Z4/6C4P-EV, Czech made,O getter,60s USD$8.48/per piece Stock : 100+ pcs. Status : NOS Box : OB or Original packing Descriptions : Tesla 6Z31 =6X4 =EZ90=CV4005=6063=6202 , made in 1960s or 1970s , very good 6X4! Perfect conditinos! PS. Chinese 6Z4 and 6X4 are very close but with different pin layout(Not directly interchangeable!):(click here...) if you want to use 6X4 in your 6Z4 amp, you need to rewire your tube base in your amp. PS. (Chinese 6Z4 ,Russian 6C4P-EV ) is same as 6X4 but with different pin layout(Not directly interchangeable!); We have converter for 6X4 to replace 6Z4/6C4P-EV , Just click here to order! => 6X4 + converter = (Chinese 6Z4 ,Russian 6C4P-EV )! (=>photo )! Available Options: box: 1.original (+USD$0.85)2.Original packing

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