(!!!!) (Slightly microphonic single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1962 (161 Series) (1.0/1.2ma and Gm=1600/1650)
(!!) (Recommended Single) EL84 Mullard UK branded RTC England NOS 1977 (40.4ma)
EL84 Siemens Halske Germany NOS 1967 (45ma)
EL84 Siemens Halske Germany used/70% 1969 (34.5ma)
EL84 Siemens Halske Germany used/tests like new 1971 no printing (48.2ma)
