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(!!) (BEST VALUE PAIR) ECC808=6KX8 Mullard Made in Germany by VALVO NOS 1969 same date codes (1.1/1.3ma and 1.2/1.1ma)
(!!!) (Best Single) ECC808=6KX8 Telefunken Diamond Bottom NOS 1968 (1.6/1.4ma Gm=1800/1700)
ECC82=12AU7 Siemens Halske "Long Ribbed Plates" and "O" getter NOS 1958 (10.4/11.8ma)
(!!!) (Best Value Single) ECC83=12AX7 Siemens Halske Germany used/good 1960's faded date code (1.3/0.9ma and Gm=1700/1500)
ECC83=12AX7 East Germany used/good 1970's in white box (1.0/0.7ma)
ECC84=6CW7 Mullard International NOS 1960 (8.8/12.2ma)
ECC84=6CW7 Mullard Sonotone NOS 1960 (11.2/11.8ma)
ECC84=6CW7 Siemens Germany Sonotone NOS 1959 (11.2/13.8ma)
(!) ECC88=6DJ8 Siemens Halske Germany branded Hewlett Packard used/60-65% small "o" getter halo 1964 (11.8/11.2ma)
ECC99 JJ (best identical substitute is 12BH7A RCA, Raytheon, Sylvania and GE)
(READ REVIEW) ECF83 Telefunken NOS 1965
ECF83 Telefunken rebranded International 1960's (3 in stock)
ECF86=6HG8 Valvo France NOS (4 in stock)
ECH3 Philips Miniwatt 1940's used/good
ECH3 Tungsram used/good 1940 era
ECH35 Philips Miniwatt like new 1940's
ECH42=6CU7 International Germany NOS made by La Radiotechnique France early 1960's (3 in stock)
ECH42=6CU7 Telefunken Germany <> bottom NOS 1966 (1 in stock)
ECH42=6CU7 Valvo Germany NOS made by La Radiotechnique France early 1960's (2 in stock)
