Amperex 12AX7Amperex Bugle Boy 12AX7's. To the best of my knowledge, these tubes are no longer obtainable, i.e., are no longer produced or sold commercially as a factory produced matched pair. In their original boxes with test certificates. Outstanding tubes that ran silently and with extraordinary detail and palpability.
On my TV-7 the tubes tested 36/36, 36/36 where 32 is the minimum acceptable.
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