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(!!!!) (Best Single #3) 12AX7A=ECC83 Amperex Globe Logo Holland ribbed plates NOS 1967 (1.0/1.0ma and Gm=1600/1700) 1-3% section balance
(!!!!) (Best Sounding Single) 12AX7A=ECC83 Amperex Globe Logo Holland ribbed plates NOS 1969 (1.3/1.4ma and Gm=1700/1800) 1-3% section balance
(!!!) (BEST PAIR) 7247=12DW7 CBS gray ribbed plates NOS 1960 (0.9/8.8ma and 0.9/8.6ma) 1-3% matched
(!!!) (Recommended Single) EF94=6AU6 Tungsol used/tests like new 1957 (10ma)
(!!) (Good Value Single) ECC82=12AU7 Philips Miniwatt Holland used/good 1965 (7.8/10ma)
(!) (Best Single) 7247=12DW7 Amperex Globe Logo by Matsushita Japan NOS 1967 similar sound to Mullard (1.5ma and 11.6ma) (High mA and Gm)
(READ REVIEW) 7247=12DW7 Mullard England rebranded Hammond and Bogen 1965-1970 (1.2/10ma and 1.1/10ma) (1-3% matched)
