It is for KT66 KT88 6SL7 6SN7 6V6 5AR4/GZ34 5R4GY 5U4G 6AS7G 6B4G 6BL7GT 6F6 6J5 6J7 6L6 6SJ7 274B 348A 350B 421A 5691,6P3P 6P6P 6n8p 6n9p 5Z3P 5Z2P 6j8p EL34 KT66 KT88 6V6 6n5p. 5pcs 8Pin Vacuum Tube Socket Base Octal;.
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