Originally designed for used with tubes like 12AX7, 12AU7, 12AT7, 12AY7, 6DJ8, 6FW8, 5751, 5814, 6072, 6922, 7308, 7316, ECC88, ECC81, ECC82, ECC83, ECC802S ECC803S, E88CC, E188CC, 7308, 6267, EF84, EF806S and similar tubes.
Originally designed for used with tubes like 12AX7, 12AU7, 12AT7, 12AY7, 6DJ8, 6FW8, 5751, 5814, 6072, 6922, 7308, 7316, ECC88, ECC81, ECC82, ECC83, ECC802S ECC803S, E88CC, E188CC, 7308, 6267, EF84, EF806S and similar tubes.