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Product 6/28 Raytheon 420A =5755 , for ECC83/12AX7,5751 , black anode ,USA made USD$15.26/per piece Stock : 100+ pcs. Status : NOS Box : MB Descriptions : This item is 420A/5755 tube! ( 5755/420A is not a direct replacement tube of ECC83/12AX7 )!! 5755/420A+ socket converter = ECC83/12AX7 !! You need to buy a converter socket if you want to use 5755/420A in your ECC83/12AX7/5755 amp!! We have such socket for sale, just choose on the bottom of this page! Raytheon 420A=5755, similar to 12AX7/ECC83 but different pin layout! 1970s or early 1980s made in USA! It need a socket converter for 12AX7/ECC83 amp. (=>hand made socket converter ), (=>[420A+ socket converter]=12AX7), Available Options: Option: + socket converter (+USD$8.48)No tube(s) matching service: +Yes (+USD$1.70)No Current Reviews: 2

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