E88C Siemens Halske NOS 1967 (17.5ma)
E88C Siemens Halske rebranded RCA Germany NOS 1968 (11.5ma)
E88C Siemens Halske rebranded RCA Germany NOS 1968 (14ma)
E88C=6DL4=6522 Siemens Germany NOS 1978 (12ma)
EC88 Amperex Bugle Boy Italy NOS 1966 (12.8ma)
EC88 Siemens Germany gold pins NOS 1965 (14ma)
EC88 Telefunken Germany NOS 1964 (10ma)
EC88 Telefunken Germany NOS 1964 (16ma)
EC88=6DL4 United France NOS 1981-1982 (2 single tubes)
EC88=6DL4 United France NOS/70-75% (1 pair)
EC88=6DL4 Valvo branded Amperex Germany NOS 1972 (11.5ma)
