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(!!!!) (Recommended Single 1959) 12AU7 Mullard Heath UK long plates "O" getter used/good 1959 (8.8/9.0ma)
(!!!!) (Single) ECC82=12AU7 Philips Miniwatt Holland NOS "O" getter 1965 (11.5/12.0ma) (High mA and Gm)
(!!) (Recommended Single) 5814A=12AU7 Hyperlec Brive France (Holland clone) NOS 1970's rebranded National (10.0/11.6ma)
(!!) (Recommended Single) 5814A=12AU7 Hyperlec Brive France (Holland clone) NOS 1970's rebranded National (11.8/12.2ma)
